minor fixups to some non-core programs

(following a bit of a doc shakeup)

src/lib/Gitolite/Triggers/CpuTime.pm

@@ -10,6 +10,7 @@ use warnings;
 
 # cpu and elapsed times for gitolite+git operations
 # ----------------------------------------------------------------------
+# uncomment the appropriate lines in the rc file to enable this
 
 # Ideally, you will (a) write your own code with a different filename so later
 # gitolite upgrades won't overwrite your copy, (b) add appropriate variables
@@ -18,8 +19,6 @@ use warnings;
 # ----------------------------------------------------------------------
 my $start_time;
 
-# this trigger is not yet documented; it gets called at the start and does not
-# receive any arguments.
 sub input {
     _warn "something wrong with the invocation of CpuTime::input" if $ENV{GL_TID} ne $$;
     $start_time = [ Time::HiRes::gettimeofday() ];

src/lib/Gitolite/Triggers/RepoUmask.pm

@@ -9,6 +9,8 @@ use warnings;
 
 # setting a repo specific umask
 # ----------------------------------------------------------------------
+# this is for people who are too paranoid to trust e.g., gitweb's repo
+# exclusion logic, but not paranoid enough to put it on a different server
 
 =for usage
 

src/lib/Gitolite/Triggers/Shell.pm

@@ -3,6 +3,9 @@ package Gitolite::Triggers::Shell;
 # usage notes: this module must be loaded first in the INPUT trigger list.  Or
 # at least before Mirroring::input anyway.
 
+# documentation is in the ssh troubleshooting and tips document, under the
+# section "giving shell access to gitolite users"
+
 use Gitolite::Rc;
 use Gitolite::Common;