Add tip about git config --global

docs/src/main/asciidoc/spring-cloud-config.adoc

@@ -321,6 +321,10 @@ that should be applicable. HTTPS proxy settings can be set in
 `~/.git/config` or in the same way as for any other JVM process via
 system properties (`-Dhttps.proxyHost` and `-Dhttps.proxyPort`).
 
+TIP: If you don't know where your `~/.git` directory is us `git config
+--global` to manipulate the settings (e.g. `git config --global
+http.sslVerify false`).
+
 ===== Placeholders in Git Search Paths
 
 Spring Cloud Config Server also supports a search path with