Add a sentence referencing the push.recurseSubmodules config to the

section that describes submodule publication.

Author: constcuriosity

book/07-git-tools/sections/submodules.asc

@@ -544,6 +544,8 @@ To https://github.com/chaconinc/MainProject
 As you can see there, Git went into the DbConnector module and pushed it before pushing the main project.
 If that submodule push fails for some reason, the main project push will also fail.
 
+You can enable these behaviors for all future pushes with the `push.recurseSubmodules` config.
+
 ===== Merging Submodule Changes
 
 If you change a submodule reference at the same time as someone else, you may run into some problems.