Remove manual descriptions of nullability in docs.

Auto-documentation adds nullability info for parameters in docs. The
manual info about nullability causes confusion and might not always be
up to date so remove it from the ContentProvider docs.

Fixes: 140541978
Test: n/a
Change-Id: I3847bbb35601f516c11370e74dd8b6734c289f68
diff --git a/core/java/android/content/ContentProvider.java b/core/java/android/content/ContentProvider.java
index 9dbfbc7..02b6b3e 100644
--- a/core/java/android/content/ContentProvider.java
+++ b/core/java/android/content/ContentProvider.java
@@ -1469,9 +1469,8 @@
      * This method can be called from multiple threads, as described in
      * <a href="{@docRoot}guide/topics/fundamentals/processes-and-threads.html#Threads">Processes
      * and Threads</a>.
-     * @param uri The content:// URI of the insertion request. This must not be {@code null}.
+     * @param uri The content:// URI of the insertion request.
      * @param values A set of column_name/value pairs to add to the database.
-     *     This must not be {@code null}.
      * @return The URI for the newly inserted item.
      */
     @Override
@@ -1538,7 +1537,6 @@
      * @param uri The URI to query. This can potentially have a record ID if this
      * is an update request for a specific record.
      * @param values A set of column_name/value pairs to update in the database.
-     *     This must not be {@code null}.
      * @param selection An optional filter to match rows to update.
      * @return the number of rows affected.
      */