git-request-pull: add page (#4241)

pages/common/git-request-pull.md

@@ -0,0 +1,12 @@
+# git request-pull
+
+> Generate a request asking the upstream project to pull changes into its tree.
+> More information: <https://git-scm.com/docs/git-request-pull>.
+
+- Produce a request summarizing the changes between the v1.1 release and master:
+
+`git request-pull {{v1.1}} {{https://example.com/project}} {{master}}`
+
+- Produce a request summarizing the changes between the v0.1 release on master branch and local foo branch:
+
+`git request-pull {{v0.1}} {{https://example.com/project}} {{master:foo}}`