Javadoc fixes (#5019)

* Javadoc fixes for App Check.

* Javadoc fixes for Functions.

* One more Javadoc fix.

Author: rosalyntan

appcheck/firebase-appcheck/src/main/java/com/google/firebase/appcheck/FirebaseAppCheck.java

@@ -76,10 +76,10 @@ public abstract void installAppCheckProviderFactory(
    * requests to a non-Firebase backend. Requests to Firebase backends are authorized automatically
    * if configured.
    *
-   * <p>If your non-Firebase backend exposes sensitive or expensive endpoints that has low traffic
+   * <p>If your non-Firebase backend exposes a sensitive or expensive endpoint that has low traffic
    * volume, consider protecting it with <a
    * href=https://firebase.google.com/docs/app-check/custom-resource-backend#replay-protection>Replay
-   * Protection</a>. In this case, use the #getLimitedUseAppCheckToken() instead to obtain a
+   * Protection</a>. In this case, use {@link #getLimitedUseAppCheckToken()} instead to obtain a
    * limited-use token.
    */
   @NonNull
@@ -92,8 +92,8 @@ public abstract void installAppCheckProviderFactory(
    * <p>Returns limited-use tokens that are intended for use with your non-Firebase backend
    * endpoints that are protected with <a
    * href=https://firebase.google.com/docs/app-check/custom-resource-backend#replay-protection>Replay
-   * Protection</a>. This method does not affect the token generation behavior of the
-   * #getAppCheckToken() method.
+   * Protection</a>. This method does not affect the token generation behavior of the {@link
+   * #getAppCheckToken(boolean forceRefresh)} method.
    */
   @NonNull
   public abstract Task<AppCheckToken> getLimitedUseAppCheckToken();

firebase-functions/src/main/java/com/google/firebase/functions/FirebaseFunctions.java

@@ -202,26 +202,26 @@ public static FirebaseFunctions getInstance() {
     return getInstance(FirebaseApp.getInstance(), "us-central1");
   }
 
-  /** Returns a reference to the Callable HTTPS trigger with the given name. */
+  /** Returns a reference to the callable HTTPS trigger with the given name. */
   @NonNull
   public HttpsCallableReference getHttpsCallable(@NonNull String name) {
     return new HttpsCallableReference(this, name, new HttpsCallOptions());
   }
 
-  /** Returns a reference to the Callable HTTPS trigger with the provided url. */
+  /** Returns a reference to the callable HTTPS trigger with the provided URL. */
   @NonNull
   public HttpsCallableReference getHttpsCallableFromUrl(@NonNull URL url) {
     return new HttpsCallableReference(this, url, new HttpsCallOptions());
   }
 
-  /** Returns a reference to the Callable HTTPS trigger with the given name and call options. */
+  /** Returns a reference to the callable HTTPS trigger with the given name and call options. */
   @NonNull
   public HttpsCallableReference getHttpsCallable(
       @NonNull String name, @NonNull HttpsCallableOptions options) {
     return new HttpsCallableReference(this, name, new HttpsCallOptions(options));
   }
 
-  /** Returns a reference to the Callable HTTPS trigger with the provided url and call options. */
+  /** Returns a reference to the callable HTTPS trigger with the provided URL and call options. */
   @NonNull
   public HttpsCallableReference getHttpsCallableFromUrl(
       @NonNull URL url, @NonNull HttpsCallableOptions options) {