Add cross refs to other booleans

ack

@@ -1309,6 +1309,8 @@ Note that the options that affect "dogs" also affect "cats", so if you have
 then the search for both "dogs" and "cats" will be case-insensitive and be
 word-limited.
 
+See also C<--or> and C<--not>.
+
 =item B<-A I<NUM>>, B<--after-context=I<NUM>>
 
 Print I<NUM> lines of trailing context after matching lines.
@@ -1566,6 +1568,8 @@ if you have
 then the search for both "dogs" and "cats" will be case-insensitive and be
 word-limited.
 
+See also C<--and> and C<--or>.
+
 =item B<-o>
 
 Show only the part of each line matching PATTERN (turns off text
@@ -1587,6 +1591,8 @@ Note that the options that affect "dogs" also affect "cats", so if you have
 then the search for both "dogs" and "cats" will be case-insensitive and be
 word-limited.
 
+See also C<--and> and C<--not>.
+
 =item B<--output=I<expr>>
 
 Output the evaluation of I<expr> for each line (turns off text