Fix more typos/spelling in comments

A few more fixes on top of the automatic spell checker generated ones.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-reflog.c

@@ -240,7 +240,7 @@ static int unreachable(struct expire_reflog_cb *cb, struct commit *commit, unsig
 static void mark_reachable(struct commit *commit, unsigned long expire_limit)
 {
 	/*
-	 * We need to compute if commit on either side of an reflog
+	 * We need to compute whether the commit on either side of a reflog
 	 * entry is reachable from the tip of the ref for all entries.
 	 * Mark commits that are reachable from the tip down to the
 	 * time threshold first; we know a commit marked thusly is

compat/cygwin.c

@@ -89,7 +89,7 @@ static int cygwin_stat(const char *path, struct stat *buf)
 /*
  * At start up, we are trying to determine whether Win32 API or cygwin stat
  * functions should be used. The choice is determined by core.ignorecygwinfstricks.
- * Reading this option is not always possible immediately as git_dir may be
+ * Reading this option is not always possible immediately as git_dir may
  * not be set yet. So until it is set, use cygwin lstat/stat functions.
  * However, if core.filemode is set, we must use the Cygwin posix
  * stat/lstat as the Windows stat functions do not determine posix filemode.

compat/fnmatch/fnmatch.c

@@ -39,7 +39,7 @@
 # include <stdlib.h>
 #endif
 
-/* For platform which support the ISO C amendment 1 functionality we
+/* For platforms which support the ISO C amendment 1 functionality we
    support user defined character classes.  */
 #if defined _LIBC || (defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H)
 /* Solaris 2.5 has a bug: <wchar.h> must be included before <wctype.h>.  */

fast-import.c

@@ -133,7 +133,7 @@ Format of STDIN stream:
      # always escapes the related input from comment processing.
      #
      # In case it is not clear, the '#' that starts the comment
-     # must be the first character on that the line (an lf have
+     # must be the first character on that line (an lf
      # preceded it).
      #
   comment ::= '#' not_lf* lf;