Add force-pull property documentation

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

@@ -359,6 +359,58 @@ searches the repository for files in the same name as the directory
 path with placeholders (any matching directory is included in the
 search).
 
+===== Force pull in Git Repositories
+
+As mentioned before Spring Cloud Config Server makes a clone of the
+remote git repository and if somehow the local copy gets dirty (e.g.
+folder content changes by OS process) so Spring Cloud Config Server
+cannot update the local copy from remote repository.
+
+To solve this there is a `force-pull` property that will make Spring Cloud
+Config Server force pull from remote repository if the local copy is dirty.
+Example:
+
+[source,yaml]
+----
+spring:
+  cloud:
+    config:
+      server:
+        git:
+          uri: https://github.com/spring-cloud-samples/config-repo
+          force-pull: true
+
+----
+
+If you have a multiple repositories configuration you can configure the
+`force-pull` property per repository. Example:
+
+[source,yaml]
+----
+spring:
+  cloud:
+    config:
+      server:
+        git:
+          uri: https://git/common/config-repo.git
+          force-pull: true
+          repos:
+            team-a:
+                pattern: team-a-*
+                uri: http://git/team-a/config-repo.git
+                force-pull: true
+            team-b:
+                pattern: team-b-*
+                uri: http://git/team-b/config-repo.git
+                force-pull: true
+            team-c:
+                pattern: team-c-*
+                uri: http://git/team-a/config-repo.git
+----
+
+NOTE: The default value for `force-pull` property is `false`.
+
+
 ==== Version Control Backend Filesystem Use
 
 WARNING: With VCS based backends (git, svn) files are checked out or cloned to the local filesystem. By default they are put in the system temporary directory with a prefix of `config-repo-`. On linux, for example it could be `/tmp/config-repo-<randomid>`. Some operating systems http://serverfault.com/questions/377348/when-does-tmp-get-cleared/377349#377349[routinely clean out] temporary directories. This can lead to unexpected behaviour such as missing properties. To avoid this problem, change the directory Config Server uses, by setting `spring.cloud.config.server.git.basedir` or `spring.cloud.config.server.svn.basedir` to a directory that does not reside in the system temp structure.