Minimal documentation of "no precompilation"

Author: lizmat

doc/Language/pragmas.pod6

@@ -103,7 +103,12 @@ usages.
 
 =item X<B<parameters>|parameters> [NYI]
 
-=item X<B<precompilation>|precompilation> [TBD]
+=item X<B<precompilation>|precompilation>
+
+The default allows precompilation of source code, specifically if used in a
+module.  If for whatever reason you do not want the code (of your module) to
+be precompiled, you can use C<no precompilation>.  This will prevent the
+entire compilation unit (usually a file) from being precompiled.
 
 =item X<B<soft>|soft> L<Re-dispatching|/language/functions#Re-dispatching>, L<inlining|/language/functions#index-entry-use_soft_(pragma)>