Update branch command docs

Update branch command docs to include details about support for patch
series and automatic push to remote. I also included a short reference
to the common use case for using the branch command so that users could
self identify and potentially dig deeper into the options and how it can
help them.

<!-- ps-id: 0d23a8e5-89bc-4030-b535-1ff7c2bd6ceb -->

src/cli.rs

@@ -123,12 +123,16 @@ pub struct BackupStackCmdOpts {
 
 #[derive(Debug, StructOpt)]
 pub enum Command {
-    /// Your bridge back to the world of normal git and git concepts.
-    /// Basically a utility to help you create a normal git branch from a
-    /// patch or series of patches that is based on the patch stack base (e.g.
-    /// origin/main). Because this is a bridge back to the normal git concepts
-    /// like branches and commits it does no state tracking of these branches
-    /// inside of git patch stack.
+    /// Your bridge back to the world of normal git and git concepts. The branch command is a
+    /// utility to help you create a normal git branch from a patch or series of patches that is
+    /// based on the patch stack base (e.g. origin/main).
+    ///
+    /// Because this is a bridge back to the normal git concepts like branches and commits it does
+    /// no state tracking of these branches.
+    ///
+    /// It also has support for automatically pushing the branch to the remote. This is useful when
+    /// you are stuck working with a team that doesn't do the Patch Stack workflow but you still
+    /// want to do it locally.
     Branch(BranchCmdOpts),
     /// Create a request review branch on the patch stack base, cherry-pick
     /// the specified patch onto it, & record association between patch &