Fix typos in files.ts (#157280)

Fix typo in files.ts

Signed-off-by: Letu Ren <fantasquex@gmail.com>

src/vs/platform/files/common/files.ts

@@ -31,7 +31,7 @@ export interface IFileService {
 	readonly onDidChangeFileSystemProviderRegistrations: Event<IFileSystemProviderRegistrationEvent>;
 
 	/**
-	 * An event that is fired when a registered file system provider changes it's capabilities.
+	 * An event that is fired when a registered file system provider changes its capabilities.
 	 */
 	readonly onDidChangeFileSystemProviderCapabilities: Event<IFileSystemProviderCapabilitiesChangeEvent>;
 
@@ -80,7 +80,7 @@ export interface IFileService {
 	hasCapability(resource: URI, capability: FileSystemProviderCapabilities): boolean;
 
 	/**
-	 * List the schemes and capabilies for registered file system providers
+	 * List the schemes and capabilities for registered file system providers
 	 */
 	listCapabilities(): Iterable<{ scheme: string; capabilities: FileSystemProviderCapabilities }>;
 
@@ -982,7 +982,7 @@ interface IBaseFileStat {
 	readonly ctime?: number;
 
 	/**
-	 * A unique identifier thet represents the
+	 * A unique identifier that represents the
 	 * current state of the file or directory.
 	 *
 	 * The value may or may not be resolved as