Apply suggestions from code review

Author: terryjreedy

InternalDocs/garbage_collector.md

@@ -286,7 +286,7 @@ object, the GC does not process it twice.
 
 Notice that an object that was marked as "tentatively unreachable" and was later
 moved back to the reachable list will be visited again by the garbage collector
-as now all the references that object has need to be processed as well. This
+as now all the references that the object has need to be processed as well. This
 process is really a breadth first search over the object graph. Once all the objects
 are scanned, the GC knows that all container objects in the tentatively unreachable
 list are really unreachable and can thus be garbage collected.

Lib/idlelib/debugger.py

@@ -1,6 +1,6 @@
 """Debug user code with a GUI interface to a subclass of bdb.Bdb.
 
-The Idb and Debugger gui instances each need a reference to each
+The Idb instance 'idb' and Debugger instance 'gui' need references to each
 other or to an rpc proxy for each other.
 
 If IDLE is started with '-n', so that user code and idb both run in the