Use "whitespace" consistently

For consistency, change "white space" and "whitespaces" to
"whitespace", fixing a couple of adjacent grammar problems in the
docs.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/diff-options.txt

@@ -175,19 +175,19 @@ endif::git-format-patch[]
 	Shorthand for "--text".
 
 --ignore-space-at-eol::
-	Ignore changes in white spaces at EOL.
+	Ignore changes in whitespace at EOL.
 
 --ignore-space-change::
-	Ignore changes in amount of white space.  This ignores white
-	space at line end, and consider all other sequences of one or
-	more white space characters to be equivalent.
+	Ignore changes in amount of whitespace.  This ignores whitespace
+	at line end, and considers all other sequences of one or
+	more whitespace characters to be equivalent.
 
 -b::
 	Shorthand for "--ignore-space-change".
 
 --ignore-all-space::
-	Ignore white space when comparing lines.  This ignores
-	difference even if one line has white space where the other
+	Ignore whitespace when comparing lines.  This ignores
+	differences even if one line has whitespace where the other
 	line has none.
 
 -w::

Documentation/glossary.txt

@@ -244,8 +244,7 @@ This commit is referred to as a "merge commit", or sometimes just a
 	The unique identifier of an <<def_object,object>>. The <<def_hash,hash>>
 	of the object's contents using the Secure Hash Algorithm
 	1 and usually represented by the 40 character hexadecimal encoding of
-	the <<def_hash,hash>> of the object (possibly followed by
-	a white space).
+	the <<def_hash,hash>> of the object.
 
 [[def_object_type]]object type::
 	One of the identifiers

diff.c

@@ -1015,7 +1015,7 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len)
 		if (line[i - 1] == '\t' && spaces)
 			space_before_tab = 1;
 
-		/* check white space at line end */
+		/* check whitespace at line end */
 		if (line[len - 1] == '\n')
 			len--;
 		if (isspace(line[len - 1]))
@@ -1029,7 +1029,7 @@ static void checkdiff_consume(void *priv, char *line, unsigned long len)
 					putchar(',');
 			}
 			if (white_space_at_end)
-				printf("white space at end");
+				printf("whitespace at end");
 			printf(":%s ", reset);
 			emit_line_with_ws(1, set, reset, ws, line, len,
 					  data->ws_rule);