fix github url

requirements/edx/github.txt

@@ -6,11 +6,11 @@
 #
 # A correct GitHub reference looks like this:
 #
-#   git+https://github.com/OWNER/REPO-NAME.git@TAG-OR-SHA#egg=DIST-NAME==VERSION
+#   git+https://git.orhontech.com/OWNER/REPO-NAME.git@TAG-OR-SHA#egg=DIST-NAME==VERSION
 #
 # For example:
 #
-#   git+https://github.com/edx/edx-lint.git@v0.3.2#egg=edx_lint==0.3.2
+#   git+https://git.orhontech.com/edx/edx-lint.git@v0.3.2#egg=edx_lint==0.3.2
 #
 # where:
 #