fixup! SECURITY.md: document Git for Windows' policies

Fix a few more unclear/incorrect phrasings (while the perfect is the
enemy of the good, the vague and the not-quite-right are the enemy of
the good-enough).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

SECURITY.md

@@ -20,17 +20,27 @@ Every Git for Windows version is tagged using a name that starts with the Git ve
 
 ## Release Candidate (rc) versions
 
-Git for Windows also releases versions that reflect the [upstream release candidates](https://tinyurl.com/gitCal). These contain the `-rc<n>` suffix to the expected regular git version, and before the 'windows' suffix. These releases are independent of upstream but are tied together by convention. It should be noted that these rc versions currently sort after their formal release, so appear to be newer to the updater software.
+As a friendly fork of Git (the "upstream" project), Git for Windows is closely corelated to that project.
 
-[All releases](https://github.com/git-for-windows/git/releases/) are listed via a link at the footer of the [Git for Windows](https://gitforwindows.org/) home page.
+Consequently, Git for Windows publishes versions based on Git's release candidates (for upcoming "`.0`" versions, see [Git's release schedule](https://tinyurl.com/gitCal)). These versions end in `-rc<n>`, starting with `-rc0` for a very early preview of what is to come, and as with regular versions, Git for Windows tries to follow Git's releases as quickly as possible.
 
-## Snapshot versions ('nightlies')
+Note: there is currently a bug in the "Check daily for updates" code, where it mistakes the final version as a downgrade from release candidates. Example: if you installed Git for Windows v2.23.0-rc3 and enabled the auto-updater, it would ask you whether you want to "downgrade" to v2.23.0 when that version was available.
 
-Git for Windows also provides snapshots (these are not releases) of the progressing upstream development from the Git-for-Windows "master" branch at the [Snapshots](https://wingit.blob.core.windows.net/files/index.html) page. Link also at the footer of the [Git for Windows](https://gitforwindows.org/) home page.
+[All releases](https://github.com/git-for-windows/git/releases/), including release candidates, are listed via a link at the footer of the [Git for Windows](https://gitforwindows.org/) home page.
 
-## Following 'upstream' developments
+## Snapshot versions ('nightly builds')
 
-The [gitforwindows/git repository](https://github.com/git-for-windows/git) also provides the shears/* and vs/master branches. The shears branches follow the upstream development with the addition of the Windows specific patches via automated continuous integration. The vs/master branch adds a commit on top of Git-for-Windows "master", providing the project files ready to build Git in Visual Studio using the MSVC tool chain.
+Git for Windows also provides snapshots (these are not releases) of the the current development as per git-for-Windows/git's `master` branch at the [Snapshots](https://wingit.blob.core.windows.net/files/index.html) page. This link is also listed in the footer of the [Git for Windows](https://gitforwindows.org/) home page.
+
+Note: even if those builds are not exactly "nightly", they are sometimes referred to as "nightly builds" to keep with other projects' nomenclature.
+
+## Following upstream's developments
+
+The [gitforwindows/git repository](https://github.com/git-for-windows/git) also provides the `shears/*` and `vs/master` branches. The `shears/*` branches reflect Git for Windows' patches, rebased onto the upstream integration branches, [updated (mostly) via automated CI builds](https://dev.azure.com/git-for-windows/git/_build?definitionId=25).
+
+# Other special branches
+
+Currently, there is only one other special-purpose branch in Git for Windows: the `vs/master` branch. It adds a commit on top of git-for-Windows/git's `master`, providing the project files ready to build Git in Visual Studio using the MSVC tool chain, [also updated via automated builds](https://dev.azure.com/git-for-windows/git/_build?definitionId=27).
 
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