[PATCH v3] doc: core.ignoreStat update, and clarify the --assume-unchanged effect

[Philip Oakley <philipoakley@iee.org>]

The assume-unchanged bit, and consequently core.ignoreStat, can be
misunderstood. Be assertive about the expectation that file changes should
notified to Git.

Overhaul the general wording thus:
    1. direct description of what is ignored given first.
    2. example instruction of the user manual action required.
    3. use sideways indirection for assume-unchanged and update-index
       references.
    4. add a 'normally' to give leeway for the change detection.

Signed-off-by: Philip Oakley <philipoakley@iee.org>
---

This is the corrected patch which now applies on top of next and has been
checked on AsciiDoc. (was $gmane/261974/focus=262022)

I have included the previous 'after three-dashes' comment and included
them in the commit message. I'm happy for it to be tweaked as appropriate.

---
 Documentation/config.txt | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 52eeadd..fe179d0 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -375,15 +375,18 @@ This is useful for excluding servers inside a firewall from
 proxy use, while defaulting to a common proxy for external domains.
 
 core.ignoreStat::
-	If true, commands which modify both the working tree and the index
-	will mark the updated paths with the "assume unchanged" bit in the
-	index. These marked files are then expected to stay unchanged in the
-	working tree. If you change them you should mark their update manually.
-	Git will normally not detect the file changes by lstat() calls.
-	This is useful on systems where those calls are very slow, such as
-	cifs/Microsoft Windows.
-	See linkgit:git-update-index[1].
-	False by default.
+	If true, Git will avoid using lstat() calls to detect if files have
+	changed. Git will set the "assume-unchanged" bit for those tracked files
+	which it has updated identically in both the index and working tree.
++
+When files are modified outside of Git, the user will need to stage
+the modified files explicitly (e.g. see 'Examples' section in
+linkgit:git-update-index[1]).
+Git will not normally detect changes to those files.
++
+This is useful on systems where lstat() calls are very slow, such as
+CIFS/Microsoft Windows.
+False by default.
 
 core.preferSymlinkRefs::
 	Instead of the default "symref" format for HEAD
-- 
1.9.5.msysgit.0