Replace acl_config with acl-config in docs.

Change-Id: I8f7c8b0800da37a7e9b97e75571a03ac14214374
Reviewed-on: https://review.openstack.org/23823
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins

doc/source/gerrit.rst

@@ -622,11 +622,11 @@ Note The gerrit-user 'example-project-creator' should be added to the
      - project: example/project1
        description: Best project ever.
        has-wiki: True
-       acl_config: /path/to/acl/file
+       acl-config: /path/to/acl/file
 
 The above config gives puppet and its related scripts enough information
 to create new projects, but not enough to add access controls to each
-project. To add access control you need to have have an ``acl_config``
+project. To add access control you need to have have an ``acl-config``
 option for the project in ``review.projects.yaml.erb`` file. That option
 should have a value that is a path to the project.config for that
 project.
@@ -661,7 +661,7 @@ a single project you will want to do the following:
    ``openstack-infra/config:modules/openstack_project/templates/review.projects.yaml.erb``.::
 
      - project: openstack/project-name
-       acl_config: /home/gerrit2/acls/project-name.config
+       acl-config: /home/gerrit2/acls/project-name.config
 
 #. If there is an existing repo that is being replaced by this new
    project you can set the upstream value for the project. When an
@@ -669,7 +669,7 @@ a single project you will want to do the following:
    instead of an empty repository. eg::
 
      - project: openstack/project-name
-       acl_config: /home/gerrit2/acls/project-name.config
+       acl-config: /home/gerrit2/acls/project-name.config
        upstream: git://github.com/awesumsauce/project-name.git
 
 That is all you need to do. Push the change to gerrit and if necessary

doc/source/stackforge.rst

@@ -55,13 +55,13 @@ look something like::
 
   - project: stackforge/project-name
     description: Latest and greatest cloud stuff.
-    acl_config: /home/gerrit2/acls/stackforge/project-name.config
+    acl-config: /home/gerrit2/acls/stackforge/project-name.config
     upstream: git://github.com/awesumsauce/project-name.git
 
 The description will set the project description on the GitHub
 StackForge mirror, and the upstream should point at an existing
 repository that should be used to preseed Gerrit. Both of these options
-are optional, but you must have an acl_config. Note that the current
+are optional, but you must have an acl-config. Note that the current
 tools assume that the upstream repo will have a master branch.
 
 The next step is to add a Gerrit ACL config file. Edit