Revert "Regexes: document :overlap and :exhaustive"

This reverts commit 09867b7.

It causes rakudo to hang on regexes.pod. TODO: reduce to minimal
example, file rakudo bug, restore the commit once fixed (or work around it)

lib/Language/regexes.pod

@@ -826,30 +826,7 @@ the start of the string, but C<:c> overrides that.
 
 =head3 Exhaustive
 
-To find all possible matches of a regex, including overlapping ones, and
-several ones that start at the same position, supply the C<:exhaustive> (short
-C<:ex>) adverb.
-
-    given 'abracadabra' {
-        for m:exhaustive/ a .* a / -> $match {
-            say ' ' x $match.from, ~$match;
-        }
-    }
-
-Produces this output:
-
-=begin code
-abracadabra
-abracada
-abraca
-abra
-   acadabra
-   acada
-   aca
-     adabra
-     ada
-       abra
-=end code
+TODO
 
 =head3 X<Global|regex adverb,:global;regex adverb,:g>
 
@@ -878,19 +855,7 @@ C<:p> is a shortcut for C<:pos>.
 
 =head3 Overlap
 
-To get several matches, including overlapping matches, but only one (the
-longest) from each starting position, specify the C<:overlap> (short C<:ov>)
-adverb:
-
-    given 'abracadabra' {
-        for m:overlap/ a .* a / -> $match {
-            say ' ' x $match.from, ~$match;
-        }
-    }
-
-produces
-
-=begin code
+TODO
 
 =head1 Best Practices and Gotchas