local modifications in a submodule would be overwritten the checkout
will fail unless `-f` is used. If nothing (or --no-recurse-submodules)
is used, the work trees of submodules will not be updated.
+ Just like linkgit:git-submodule[1], this will detach the
+ submodules HEAD.
<branch>::
Branch to checkout; if it refers to a branch (i.e., a name that,
commit, your HEAD becomes "detached" and you are no longer on
any branch (see below for details).
+
-As a special case, the `"@{-N}"` syntax for the N-th last branch/commit
-checks out branches (instead of detaching). You may also specify
-`-` which is synonymous with `"@{-1}"`.
+You can use the `"@{-N}"` syntax to refer to the N-th last
+branch/commit checked out using "git checkout" operation. You may
+also specify `-` which is synonymous to `"@{-1}`.
+
-As a further special case, you may use `"A...B"` as a shortcut for the
+As a special case, you may use `"A...B"` as a shortcut for the
merge base of `A` and `B` if there is exactly one merge base. You can
leave out at most one of `A` and `B`, in which case it defaults to `HEAD`.