Remove git:// openstack references

This updates various parts of documentation to use https, rather than
git, which is not implemented by gitea

Change-Id: I8d2a93128dcdaba0a00b43d18652781733f90cf0
Story: #2004627
Task: #29701
diff --git a/doc/source/plugins.rst b/doc/source/plugins.rst
index c694729..b1f2397 100644
--- a/doc/source/plugins.rst
+++ b/doc/source/plugins.rst
@@ -99,7 +99,7 @@
 
 An example would be as follows::
 
-  enable_plugin ec2-api git://git.openstack.org/openstack/ec2-api
+  enable_plugin ec2-api https://git.openstack.org/openstack/ec2-api
 
 plugin.sh contract
 ==================
@@ -277,7 +277,7 @@
   # note the actual url here is somewhat irrelevant because it
   # caches in nodepool, however make it a valid url for
   # documentation purposes.
-  export DEVSTACK_LOCAL_CONFIG="enable_plugin ec2-api git://git.openstack.org/openstack/ec2-api"
+  export DEVSTACK_LOCAL_CONFIG="enable_plugin ec2-api https://git.openstack.org/openstack/ec2-api"
 
 See Also
 ========