[PATCH 3/8] docs: use <sha1> to mean unabbreviated ID

[Mark Lodato <lodatom@gmail.com>]

There are some places that literally require a full, 40-character SHA-1
ID, rather than a generic revision specifier.  Introduce in git(1) the
<sha1> terminology to mean this.  Use <sha1> in git-diff-tree(1) to note
that --stdin only takes <sha1>s, not generic <tree>s or <commit>s.
Use <tree> and <commit> in the usage statement for 'commit-tree'.

Signed-off-by: Mark Lodato <lodatom@gmail.com>
---
 Documentation/git-diff-tree.txt |    4 ++--
 Documentation/git.txt           |    5 +++++
 builtin/commit-tree.c           |    2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-diff-tree.txt b/Documentation/git-diff-tree.txt
index a7e37b8..6b357a5 100644
--- a/Documentation/git-diff-tree.txt
+++ b/Documentation/git-diff-tree.txt
@@ -49,8 +49,8 @@ include::diff-options.txt[]
 --stdin::
 	When '--stdin' is specified, the command does not take
 	<tree-ish> arguments from the command line.  Instead, it
-	reads lines containing either two <tree>, one <commit>, or a
-	list of <commit> from its standard input.  (Use a single space
+	reads lines containing <sha1>s: either two trees, one commit, or
+	multiple commits from its standard input.  (Use a single space
 	as separator.)
 +
 When two trees are given, it compares the first tree with the second.
diff --git a/Documentation/git.txt b/Documentation/git.txt
index 0128371..7929739 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -457,6 +457,11 @@ list.
 
 Identifier Terminology
 ----------------------
+<sha1>::
+	Indicates a full, 40-character SHA-1 identifier of an object.
+	The type of the referenced object is unspecified.
+	Abbreviated or symbolic identifiers cannot be used.
+
 <object>::
 	Indicates the object name for any type of object.
 
diff --git a/builtin/commit-tree.c b/builtin/commit-tree.c
index d083795..da572c3 100644
--- a/builtin/commit-tree.c
+++ b/builtin/commit-tree.c
@@ -9,7 +9,7 @@
 #include "builtin.h"
 #include "utf8.h"
 
-static const char commit_tree_usage[] = "git commit-tree <sha1> [(-p <sha1>)...] < changelog";
+static const char commit_tree_usage[] = "git commit-tree <tree> [(-p <commit>)...] < changelog";
 
 static void new_parent(struct commit *parent, struct commit_list **parents_p)
 {
-- 
1.7.3.2