[backport] Fix spelling typos (#12755)

tests/assert/tassert2.nim

@@ -118,7 +118,7 @@ block: ## checks for issue https://github.com/nim-lang/Nim/issues/9301
     # used to const fold as false
     checkMsg(e.msg, "tassert2.nim(116, 14) `1 + 1 == 3` ", "test10")
 
-block: ## checks AST isnt' transformed as it used to
+block: ## checks AST isn't transformed as it used to
   let a = 1
   try:
     doAssert a > 1

tests/deps/x11-1.0/xkb.nim

@@ -40,7 +40,7 @@
 #         while translating this code. ;)
 #
 #         I want to thanks #fpc channel in freenode irc, for helping me, and to put up with my
-#         wierd questions ;)
+#         weird questions ;)
 #
 #         Thanks for mmc in #xlib on freenode irc And so for the channel itself for the helping me to
 #         understanding some of the problems I had converting this headers and pointing me to resources
@@ -62,7 +62,7 @@
 #        2004/10/03           - Joined xkbstr.pas into xkb.pas because of the circular calls problems.
 #                             - Added the history of xkbstr.pas above this addition.
 #
-#        2004/09/17           - Fixed a wrong convertion number of XkbPerKeyBitArraySize, insted
+#        2004/09/17           - Fixed a wrong convertion number of XkbPerKeyBitArraySize, instead
 #                               of float, it's now converted into integer (as it should have been).
 #
 #        2004/09/15 - 16      - Convertion from the c header of XKB.h.

tests/deps/x11-1.0/xkblib.nim

@@ -33,7 +33,7 @@
 #         while translating this code. ;)
 #
 #         I want to thanks #fpc channel in freenode irc, for helping me, and to put up with my
-#         wierd questions ;)
+#         weird questions ;)
 #
 #         Thanks for mmc in #xlib on freenode irc And so for the channel itself for the helping me to
 #         understanding some of the problems I had converting this headers and pointing me to resources