Doc fixes for missing refs.

Author: nascheme

Doc/library/decimal.rst

@@ -1892,7 +1892,7 @@ new threads.  If the flag is false, new threads will start with an empty
 context.  In this case, :func:`getcontext` will create a new context object
 when called and use the default values from *DefaultContext*.  If the flag
 is true, new threads will start with a copy of context from the caller of
-:meth:`Thread.start`.
+:meth:`threading.Thread.start`.
 
 To control the defaults so that each thread will use the same values throughout
 the application, directly modify the *DefaultContext* object. This should be

Doc/library/warnings.rst

@@ -680,8 +680,8 @@ context_aware_warnings<-X>` command-line option or by the
         it.  When true, the context established by :class:`catch_warnings`
         in one thread will also apply to new threads started by it.  If false,
         new threads will start with an empty warnings context variable,
-        meaning that only the filters in :data:`warnings.filters` will be
-        active.
+        meaning that any filtering that was established by a
+        :class:`catch_warnings` context manager will no longer be active.
 
 .. versionchanged:: 3.14