patchdoc: clarify description of 'submodule.recurse'

From: Philippe Blain <levraiphilippeblain@gmail.com>

The doc for 'submodule.recurse' starts with "Specifies if commands recurse into submodles by default". This is not exactly true of all commands that have a '--recurse-submodules' option. For example, 'git pull --recurse-submodules' does not run 'git pull' in each submodule, but rather runs 'git submodule update --recursive' so that the submodule working trees after the pull matches the commits recorded in the superproject.

Clarify that by just saying that it enables '--recurse-submodules'.

Note that the way this setting interacts with 'fetch.recurseSubmodules' and 'push.recurseSubmodules', which can have other values than true or false, is already documented since 4da9e99e6e (doc: be more precise on (fetch|push).recurseSubmodules, 2020-04-06).

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
---
    doc: clarify description of 'submodule.recurse'
    
    The current wording confused at least one user [1], so let's clarify
    that.
    
    [1]
    https://stackoverflow.com/questions/4611512/is-there-a-way-to-make-git-pull-automatically-update-submodules/49427199?noredirect=1#comment119208094_49427199

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-997%2Fphil-blain%2Fsubmodule.recurse-doc-clarify-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-997/phil-blain/submodule.recurse-doc-clarify-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/997

 Documentation/config/submodule.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)