Add linting check for RST code blocks. Fix code block languages.

antsibull-nox.toml

@@ -32,6 +32,15 @@ run_mypy = false
 
 [sessions.docs_check]
 validate_collection_refs="all"
+codeblocks_restrict_types = [
+    "ansible-output",
+    "console",
+    "yaml",
+    "yaml+jinja",
+]
+codeblocks_restrict_type_exact_case = true
+codeblocks_allow_without_type = false
+codeblocks_allow_literal_blocks = false
 
 [sessions.license_check]