[PATCH] doc: add that '-' is the same as '@{-1}'

["ryicoh via GitGitGadget" <gitgitgadget@gmail.com>]

From: ryicoh <ryicoh@gmail.com>

Signed-off-by: ryicoh <ryicoh@gmail.com>
---
    doc: add that '-' is the same as '@{-1}'
    
    Now, the document of '-' is written only git-switch.txt.
    
    https://github.com/git/git/blob/6369acd968d02899973a9a853c48029b92cea401/Documentation/git-switch.txt#L51
    
    I want same one in revisions.txt.
    
    Thank you.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1484%2Fryicoh%2Fdoc-hyphen-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1484/ryicoh/doc-hyphen-v1
Pull-Request: https://github.com/git/git/pull/1484

 Documentation/revisions.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/revisions.txt b/Documentation/revisions.txt
index 9aa58052bc7..9e7ea2cf71e 100644
--- a/Documentation/revisions.txt
+++ b/Documentation/revisions.txt
@@ -94,7 +94,8 @@ some output processing may assume ref names in UTF-8.
 
 '@{-<n>}', e.g. '@{-1}'::
   The construct '@{-<n>}' means the <n>th branch/commit checked out
-  before the current one.
+  before the current one. You may also specify - which is synonymous
+  to @{-1}.
 
 '[<branchname>]@\{upstream\}', e.g. 'master@\{upstream\}', '@\{u\}'::
   A branch B may be set up to build on top of a branch X (configured with

base-commit: 6369acd968d02899973a9a853c48029b92cea401
-- 
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