Update PeterG's internals documentation per comments from

Monty; minor changes only.

Docs/internals.texi

@@ -4615,7 +4615,7 @@ sql_olap.cc  --  ROLLUP
 @item
 sql_parse.cc  --  Parse an SQL statement; do initial checks and then jump to the function that should execute the statement
 @item
-sql_prepare.cc  --  Prepare an SQL statement
+sql_prepare.cc  --  Prepare an SQL statement, or use a prepared statement
 @item
 sql_repl.cc  --  Replication
 @item
@@ -5039,9 +5039,9 @@ manual at: @*
 There is therefore no need to list the modules in this document.
 @*@*
 
-The MySQL program that uses zlib is \mysys\my_compress.c. The use is
-for packet compression. The client sends messages to the server which
-are compressed by zlib. See also: \sql\net_serv.cc.
+The MySQL program \mysys\my_compress.c uses zlib for packet compression. 
+The client sends messages to the server which are compressed by zlib. 
+See also: \sql\net_serv.cc.
 
 @node Files in InnoDB Sources,  , Files in MySQL Sources, Top
 @chapter Annotated List Of Files in the InnoDB Source Code Distribution