use 'tree-ish' instead of 'treeish'

Replace 'treeish' in documentation and comments with 'tree-ish' to
match gitglossary(7).

The only remaining instances of 'treeish' are:
  * variable, function, and macro names
  * "(also treeish)" in the definition of tree-ish in gitglossary(7)

Signed-off-by: Richard Hansen <rhansen@bbn.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.7.11.2.txt

@@ -31,7 +31,7 @@ Fixes since v1.7.11.1
  * "git diff --no-index" did not work with pagers correctly.
 
  * "git diff COPYING HEAD:COPYING" gave a nonsense error message that
-   claimed that the treeish HEAD did not have COPYING in it.
+   claimed that the tree-ish HEAD did not have COPYING in it.
 
  * When "git log" gets "--simplify-merges/by-decoration" together with
    "--first-parent", the combination of these options makes the

Documentation/git-cat-file.txt

@@ -54,7 +54,7 @@ OPTIONS
 
 --textconv::
 	Show the content as transformed by a textconv filter. In this case,
-	<object> has be of the form <treeish>:<path>, or :<path> in order
+	<object> has be of the form <tree-ish>:<path>, or :<path> in order
 	to apply the filter to the content recorded in the index at <path>.
 
 --batch::

Documentation/git-merge-tree.txt

@@ -13,7 +13,7 @@ SYNOPSIS
 
 DESCRIPTION
 -----------
-Reads three treeish, and output trivial merge results and
+Reads three tree-ish, and output trivial merge results and
 conflicting stages to the standard output.  This is similar to
 what three-way 'git read-tree -m' does, but instead of storing the
 results in the index, the command outputs the entries to the

fast-import.c

@@ -2957,7 +2957,7 @@ static struct object_entry *dereference(struct object_entry *oe,
 	case OBJ_TAG:
 		break;
 	default:
-		die("Not a treeish: %s", command_buf.buf);
+		die("Not a tree-ish: %s", command_buf.buf);
 	}
 
 	if (oe->pack_id != MAX_PACK_ID) {	/* in a pack being written */
@@ -3041,7 +3041,7 @@ static void parse_ls(struct branch *b)
 	struct tree_entry *root = NULL;
 	struct tree_entry leaf = {NULL};
 
-	/* ls SP (<treeish> SP)? <path> */
+	/* ls SP (<tree-ish> SP)? <path> */
 	p = command_buf.buf + strlen("ls ");
 	if (*p == '"') {
 		if (!b)

git-cvsserver.perl

@@ -4338,7 +4338,7 @@ sub getAnyHead
 =head2 getRevisionDirMap
 
 A "revision dir map" contains all the plain-file filenames associated
-with a particular revision (treeish), organized by directory:
+with a particular revision (tree-ish), organized by directory:
 
   $type = $out->{$dir}{$fullName}
 

test-match-trees.c

@@ -12,10 +12,10 @@ int main(int ac, char **av)
 		die("cannot parse %s as an object name", av[2]);
 	one = parse_tree_indirect(hash1);
 	if (!one)
-		die("not a treeish %s", av[1]);
+		die("not a tree-ish %s", av[1]);
 	two = parse_tree_indirect(hash2);
 	if (!two)
-		die("not a treeish %s", av[2]);
+		die("not a tree-ish %s", av[2]);
 
 	shift_tree(one->object.sha1, two->object.sha1, shifted, -1);
 	printf("shifted: %s\n", sha1_to_hex(shifted));