docs: fix app.getPath types so that "name" is a string enum (#19480)

* docs: fix app.getPath types so that "name" is a string enum

Fixes https://github.com/electron/typescript-definitions/issues/140

* Update app.md

docs/api/app.md

@@ -590,13 +590,7 @@ Returns `String` - The current application directory.
 
 ### `app.getPath(name)`
 
-* `name` String
+* `name` String - You can request the following paths by the name:
-
-Returns `String` - A path to a special directory or file associated with `name`. On
-failure, an `Error` is thrown.
-
-You can request the following paths by the name:
-
   * `home` User's home directory.
   * `appData` Per-user application data directory, which by default points to:
     * `%APPDATA%` on Windows
@@ -604,6 +598,7 @@ You can request the following paths by the name:
     * `~/Library/Application Support` on macOS
   * `userData` The directory for storing your app's configuration files, which by
     default it is the `appData` directory appended with your app's name.
+  * `cache`
   * `temp` Temporary directory.
   * `exe` The current executable file.
   * `module` The `libchromiumcontent` library.
@@ -616,6 +611,9 @@ You can request the following paths by the name:
   * `logs` Directory for your app's log folder.
   * `pepperFlashSystemPlugin` Full path to the system version of the Pepper Flash plugin.
 
+Returns `String` - A path to a special directory or file associated with `name`. On
+failure, an `Error` is thrown.
+
 ### `app.getFileIcon(path[, options])`
 
 * `path` String

spec-main/api-app-spec.ts

@@ -683,7 +683,7 @@ describe('app module', () => {
 
     it('throws an error when the name is invalid', () => {
       expect(() => {
-        app.getPath('does-not-exist')
+        app.getPath('does-not-exist' as any)
       }).to.throw(/Failed to get 'does-not-exist' path/)
     })
 
@@ -701,7 +701,7 @@ describe('app module', () => {
       app.setPath('music', badPath)
       expect(fs.existsSync(badPath)).to.be.false
 
-      expect(() => { app.getPath(badPath) }).to.throw()
+      expect(() => { app.getPath(badPath as any) }).to.throw()
     })
   })