patch 9.1.1648: MS-Windows: some style issues with patch v9.1.1646

Problem:  MS-Windows: some style issues with patch v9.1.1646
Solution: Fix typose and code style issues (zeertzjq).

closes: #18036

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/filepath.c

@@ -360,7 +360,7 @@ repeat:
 
 	// FullName_save() is slow, don't use it when not needed.
 	if (*p != NUL || !vim_isAbsName(*fnamep)
-#ifdef MSWIN	// enforce drive letter on windows paths
+#ifdef MSWIN	// enforce drive letter on Windows paths
 		|| **fnamep == '/' || **fnamep == '\\'
 #endif
 	)
@@ -3114,9 +3114,9 @@ vim_fnamencmp(char_u *x, char_u *y, size_t len)
     int		cx = NUL;
     int		cy = NUL;
 
-#ifdef MSWIN
+# ifdef MSWIN
     /*
-     * To allow proper comparisson of absolute paths:
+     * To allow proper comparison of absolute paths:
      *	 - one with explicit drive letter C:\xxx
      *	 - another with implicit drive letter \xxx
      * advance the pointer, of the explicit one, to skip the drive
@@ -3135,7 +3135,7 @@ vim_fnamencmp(char_u *x, char_u *y, size_t len)
 	    py += mb_ptr2len(py);
 	    cy = PTR2CHAR(py);
 	    if (cy == ':' && drive == _getdrive())
-	    { // skip the drive for comparisson
+	    { // skip the drive for comparison
 		py += mb_ptr2len(py);
 		break;
 	    }
@@ -3148,7 +3148,7 @@ vim_fnamencmp(char_u *x, char_u *y, size_t len)
 	px = py;
 	py = tmp;
     }
-#endif
+# endif
 
     while (len > 0)
     {

src/os_mswin.c

@@ -319,7 +319,7 @@ mch_FullName(
 mch_isFullName(char_u *fname)
 {
     // A name like "d:/foo" and "//server/share" is absolute.  "d:foo" is not.
-    // /foo and \foo are absolute too because windows keeps a current drive.
+    // /foo and \foo are absolute too because Windows keeps a current drive.
     // Another way to check is to use mch_FullName() and see if the result is
     // the same as the name or mch_FullName() fails.  However, this has quite a
     // bit of overhead, so let's not do that.

src/testdir/test_cd.vim

@@ -223,7 +223,7 @@ func Test_cd_completion()
   set cdpath&
 
   if has('win32')
-    " Test windows absolute path completion
+    " Test Windows absolute path completion
     " Retrieve a suitable dir in the current drive
     let dir = readdir('/', 'isdirectory("/" .. v:val) && len(v:val) > 2')[-1]
     " Get partial path

src/version.c

@@ -719,6 +719,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1648,
 /**/
     1647,
 /**/