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[PATCH 2/2] config/alias.txt: document alias accepting non-command first word

One can see that an alias that begins with a non-command first word,
such as `loud-rebase = -c commit.verbose=true rebase`, is permitted.
However, this isn't immediately obvious to users as alias instances
typically begin with a command.

Document the fact that an alias can begin with a non-command first word
so that users will be able to discover that this is a feature.

Signed-off-by: Denton Liu <liu.denton@xxxxxxxxx>
 Documentation/config/alias.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/config/alias.txt b/Documentation/config/alias.txt
index 5425449a50..f241f03ebe 100644
--- a/Documentation/config/alias.txt
+++ b/Documentation/config/alias.txt
@@ -7,6 +7,14 @@ alias.*::
 	spaces, the usual shell quoting and escaping is supported.
 	A quote pair or a backslash can be used to quote them.
+Note that the first word of an alias does not necessarily have to be a
+command. It can be a command-line option that will be passed into the
+invocation of `git`. In particular, this is useful when used with `-c`
+to pass in one-time configurations. For example,
+`loud-rebase = -c commit.verbose=true rebase` can be defined such that
+running `git loud-merge` would be equivalent to
+`git -c commit.verbose=true rebase`.
 If the alias expansion is prefixed with an exclamation point,
 it will be treated as a shell command.  For example, defining
 `alias.new = !gitk --all --not ORIG_HEAD`, the invocation