Use semantic markup (#645)

* Use semantic markup.

* Linting.

* Define docsite targets.

* Forgot one env var.

* Add array stubs.

plugins/modules/docker_stack.py

@@ -68,8 +68,8 @@ options:
     choices: ["always", "changed", "never"]
   absent_retries:
     description:
-      - If C(>0) and I(state) is C(absent) the module will retry up to
-        I(absent_retries) times to delete the stack until all the
+      - If larger than V(0) and O(state=absent) the module will retry up to
+        O(absent_retries) times to delete the stack until all the
         resources have been effectively deleted.
         If the last try still reports the stack as not completely
         removed the module will fail.
@@ -77,7 +77,7 @@ options:
     default: 0
   absent_retries_interval:
     description:
-      - Interval in seconds between consecutive I(absent_retries).
+      - Interval in seconds between consecutive O(absent_retries).
     type: int
     default: 1