[ty] update implicit root docs (#21955)

## Summary

./tests is now no longer an implicit root, per
https://github.com/astral-sh/ruff/pull/21817

crates/ty/docs/configuration.md

@@ -158,7 +158,7 @@ If left unspecified, ty will try to detect common project layouts and initialize
 * if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path
 * otherwise, default to `.` (flat layout)
 
-Besides, if a `./python` or `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),
+Additionally, if a `./python` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),
 it will also be included in the first party search path.
 
 **Default value**: `null`
@@ -443,7 +443,7 @@ If left unspecified, ty will try to detect common project layouts and initialize
 * if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path
 * otherwise, default to `.` (flat layout)
 
-Besides, if a `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),
+Additionally, if a `./python` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),
 it will also be included in the first party search path.
 
 **Default value**: `null`

crates/ty_project/src/metadata/options.rs

@@ -516,7 +516,7 @@ pub struct EnvironmentOptions {
     /// * if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path
     /// * otherwise, default to `.` (flat layout)
     ///
-    /// Besides, if a `./python` or `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),
+    /// Additionally, if a `./python` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),
     /// it will also be included in the first party search path.
     #[serde(skip_serializing_if = "Option::is_none")]
     #[option(
@@ -658,7 +658,7 @@ pub struct SrcOptions {
     /// * if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path
     /// * otherwise, default to `.` (flat layout)
     ///
-    /// Besides, if a `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),
+    /// Additionally, if a `./python` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),
     /// it will also be included in the first party search path.
     #[serde(skip_serializing_if = "Option::is_none")]
     #[option(

ty.schema.json

@@ -112,7 +112,7 @@
           ]
         },
         "root": {
-          "description": "The root paths of the project, used for finding first-party modules.\n\nAccepts a list of directory paths searched in priority order (first has highest priority).\n\nIf left unspecified, ty will try to detect common project layouts and initialize `root` accordingly:\n\n* if a `./src` directory exists, include `.` and `./src` in the first party search path (src layout or flat)\n* if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path\n* otherwise, default to `.` (flat layout)\n\nBesides, if a `./python` or `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),\nit will also be included in the first party search path.",
+          "description": "The root paths of the project, used for finding first-party modules.\n\nAccepts a list of directory paths searched in priority order (first has highest priority).\n\nIf left unspecified, ty will try to detect common project layouts and initialize `root` accordingly:\n\n* if a `./src` directory exists, include `.` and `./src` in the first party search path (src layout or flat)\n* if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path\n* otherwise, default to `.` (flat layout)\n\nAdditionally, if a `./python` directory exists and is not a package (i.e. it does not contain an `__init__.py` or `__init__.pyi` file),\nit will also be included in the first party search path.",
           "type": [
             "array",
             "null"
@@ -1171,7 +1171,7 @@
           ]
         },
         "root": {
-          "description": "The root of the project, used for finding first-party modules.\n\nIf left unspecified, ty will try to detect common project layouts and initialize `src.root` accordingly:\n\n* if a `./src` directory exists, include `.` and `./src` in the first party search path (src layout or flat)\n* if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path\n* otherwise, default to `.` (flat layout)\n\nBesides, if a `./tests` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),\nit will also be included in the first party search path.",
+          "description": "The root of the project, used for finding first-party modules.\n\nIf left unspecified, ty will try to detect common project layouts and initialize `src.root` accordingly:\n\n* if a `./src` directory exists, include `.` and `./src` in the first party search path (src layout or flat)\n* if a `./<project-name>/<project-name>` directory exists, include `.` and `./<project-name>` in the first party search path\n* otherwise, default to `.` (flat layout)\n\nAdditionally, if a `./python` directory exists and is not a package (i.e. it does not contain an `__init__.py` file),\nit will also be included in the first party search path.",
           "anyOf": [
             {
               "$ref": "#/definitions/RelativePathBuf"