[PATCH v3] doc: do not use `rm .git/index` when normalizing line endings

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When illustrating how to normalize the line endings, the
documentation in gitattributes tells the user to `rm .git/index`.

This is incorrect for two reasons:

 - Users shouldn't be instructed to mess around with the internal
   implementation of Git using raw file system tools like `rm`.

 - Within a submodule or an additional working tree `.git` is just a
   file containing a `gitdir: <path>` pointer into the real `.git`
   directory.  Therefore `rm .git/index` does not work.

The purpose or `rm .git/index` instruction is to remove all entries
from the index without touching the working tree.  The way to do this
with Git is to use `read-tree --empty`.

Signed-off-by: Andreas Heiduk <asheiduk@xxxxxxxxx>
Helped-by: Junio C Hamano <gitster@xxxxxxxxx>
Helped-by: Torsten Bögershausen <tboegi@xxxxxx>
---
 Documentation/gitattributes.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 473648386..2a2d7e2a4 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -229,7 +229,7 @@ From a clean working directory:
 
 -------------------------------------------------
 $ echo "* text=auto" >.gitattributes
-$ rm .git/index     # Remove the index to re-scan the working directory
+$ git read-tree --empty   # Clean index, force re-scan of working directory
 $ git add .
 $ git status        # Show files that will be normalized
 $ git commit -m "Introduce end-of-line normalization"
-- 
2.13.0




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