Revert "treewide: replace rev with tag" (NixOS#397016)

Author: K900

doc/languages-frameworks/crystal.section.md

@@ -9,7 +9,7 @@ let
     src = pkgs.fetchFromGitHub {
       owner = "giterlizzi";
       repo = "dokuwiki-template-bootstrap3";
-      tag = "v${version}";
+      rev = "v${version}";
       hash = "sha256-B3Yd4lxdwqfCnfmZdp+i/Mzwn/aEuZ0ovagDxuR6lxo=";
     };
     installPhase = "mkdir -p $out; cp -R * $out/";

doc/languages-frameworks/dart.section.md

@@ -21,7 +21,7 @@ let
   airwave-src = fetchFromGitHub {
     owner = "phantom-code";
     repo = "airwave";
-    tag = version;
+    rev = version;
     sha256 = "1ban59skw422mak3cp57lj27hgq5d3a4f6y79ysjnamf8rpz9x4s";
   };
 

doc/languages-frameworks/dlang.section.md

@@ -66,7 +66,7 @@ stdenv.mkDerivation rec {
   # result in an empty archive. See https://tracker.ardour.org/view.php?id=7328 for more info.
   src = fetchgit {
     url = "git://git.ardour.org/ardour/ardour.git";
-    tag = version;
+    rev = version;
     hash = "sha256-cmYt6fGYuuVs6YhAXaO9AG6TrYLDVUaE1/iC67rt76I=";
   };