Update Wiki URLs to point to GitLab

This moves all URL references to Trac Wiki to their corresponding
GitLab counterparts.

This substitution is classified as follows:

1. Automated substitution using sed with Ben's mapping rule [1]
    Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...
    New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...

2. Manual substitution for URLs containing `#` index
    Old: ghc.haskell.org/trac/ghc/wiki/XxxYyy...#Zzz
    New: gitlab.haskell.org/ghc/ghc/wikis/xxx-yyy...#zzz

3. Manual substitution for strings starting with `Commentary`
    Old: Commentary/XxxYyy...
    New: commentary/xxx-yyy...

See also !539

[1]: https://gitlab.haskell.org/bgamari/gitlab-migration/blob/master/wiki-mapping.json

1 files changed, 2 insertions, 2 deletions

diff --git a/validate b/validate
index 8ceaa6105d..6b529cf55b 100755
--- a/validate
+++ b/validate
@@ -7,7 +7,7 @@ show_help () {
 Usage: $0 [FLAGS]...
 
 Validate GHC source tree against testsuite; see
-http://ghc.haskell.org/trac/ghc/wiki/TestingPatches for more
+https://gitlab.haskell.org/ghc/ghc/wikis/testing-patches for more
 information.
 
 Flags:
@@ -160,7 +160,7 @@ echo "ValidateHpc=$hpc"     >> mk/are-validating.mk
 
 # Note [Default build system verbosity].
 #
-# From https://ghc.haskell.org/trac/ghc/wiki/Design/BuildSystem:
+# From https://gitlab.haskell.org/ghc/ghc/wikis/design/build-system:
 #
 #   "The build system should clearly report what it's doing (and sometimes
 #   why), without being too verbose. It should emit actual command lines as