Fix broken documentation in telephony and telecomm

Due to a bug in the build system, broken @see/@link references have not
failed to build for a while, so many errors have accumulated.

This is an attempt to patch up the telephony and telecomm docs. The
most common errors and fixes were:
- @link-ing IntDef constants from javadoc. IntDefs are not present
  in the docs, so rewrite those to natural english, or point to the
  constant prefixes
- Javadoc for public symbols referencing SystemApi symbols. Change those
  to @code instead of @link

There were various other fixes too, and I'm not sure they're all
perfect, but certainly an improvement over the brokenness we have
currently.

Bug: 303184203
Test: m docs
Change-Id: I5cefc72074ced29c0b046cf59deb7ee371e74bf0
diff --git a/telecomm/java/android/telecom/PhoneAccountSuggestion.java b/telecomm/java/android/telecom/PhoneAccountSuggestion.java
index d9f89d5..c83804f 100644
--- a/telecomm/java/android/telecom/PhoneAccountSuggestion.java
+++ b/telecomm/java/android/telecom/PhoneAccountSuggestion.java
@@ -68,7 +68,7 @@
 
     /**
      * Creates a new instance of {@link PhoneAccountSuggestion}. This constructor is intended for
-     * use by apps implementing a {@link PhoneAccountSuggestionService}, and generally should not be
+     * use by apps implementing a {@code PhoneAccountSuggestionService}, and generally should not be
      * used by dialer apps other than for testing purposes.
      *
      * @param handle The {@link PhoneAccountHandle} for this suggestion.