Fix spellings (#12277) [backport]

(cherry picked from commit 39290cf88c)

tests/stdlib/tgetfileinfo.nim

@@ -14,7 +14,7 @@ import os, strutils
 #  8 - Handle : Invalid Handle
 
 proc genBadFileName(limit = 100): string =
-    ## Generates a filename of a nonexistant file.
+    ## Generates a filename of a nonexistent file.
     ## Returns "" if generation fails.
     result = "a"
     var hitLimit = true

tests/stdlib/tjsonmacro.nim

@@ -90,7 +90,7 @@ when true:
     doAssert result.other == node["other"].getBiggestInt()
 
   # TODO: Test object variant with set in of branch.
-  # TODO: Should we support heterogenous arrays?
+  # TODO: Should we support heterogeneous arrays?
 
   # Tests that verify the error messages for invalid data.
   block:

tests/stdlib/tosproc.nim

@@ -35,7 +35,7 @@ when defined(case_testfile): # compiled test file for child process
       # failed. The shell (and lldb debugger) solves that by inserting a
       # helpful msg: `segmentation fault` when it detects a signal killed
       # the child.
-      # todo: expose an API that will show more diagnostic, returing
+      # todo: expose an API that will show more diagnostic, returning
       # (exitCode, signal) instead of just `shellExitCode`.
       if true: quit(139)
     of "exit_recursion": # stack overflow by infinite recursion

tests/stdlib/trepr2.nim

@@ -2,7 +2,7 @@ discard """
 outputsub: ""
 """
 
-# output not testable because repr prints pointer adresses
+# output not testable because repr prints pointer addresses
 # test the new "repr" built-in proc
 
 type

tests/stdlib/ttimes.nim

@@ -95,7 +95,7 @@ template runTimezoneTests() =
 
   # Bug with parse not setting DST properly if the current local DST differs from
   # the date being parsed. Need to test parse dates both in and out of DST. We
-  # are testing that be relying on the fact that tranforming a TimeInfo to a Time
+  # are testing that be relying on the fact that transforming a TimeInfo to a Time
   # and back again will correctly set the DST value. With the incorrect parse
   # behavior this will introduce a one hour offset from the named time and the
   # parsed time if the DST value differs between the current time and the date we
@@ -155,7 +155,7 @@ suite "ttimes":
       # impossible time period
       check initDateTime(26, mMar, 2017, 02, 30, 00).format(f) ==
         "2017-03-26 03:30 +02:00"
-      # In case of an ambiguous time, the earlier time is choosen
+      # In case of an ambiguous time, the earlier time is chosen
       check initDateTime(29, mOct, 2017, 02, 00, 00).format(f) ==
         "2017-10-29 02:00 +02:00"
       # These are just dates on either side of the dst switch