remove tag directive info from guidelines

contributing_to_docs/doc_guidelines.adoc

@@ -419,56 +419,6 @@ When using the "Prerequisites", "Next steps", or "Additional resources" headings
 Only use `.` formatting (`.Additional resources`) to follow a module in an assembly. Because you cannot use the xrefs in modules, this functions as a _trailing include_ at the assembly level, where the `.` formatting of the `include` statement indicates that the resource applies specifically to the module and not to the assembly.
 ====
 
-=== Including by tags
-You can use `tag` attributes to link:https://docs.asciidoctor.org/asciidoc/latest/directives/include-tagged-regions[define regions of a file and include by tag instead of the whole file.] This enables you to make conditional modifications to existing modules instead of duplicating content. When creating a tag, use a tag name that makes it easy to understand where the content defined will be included.
-
-* In assembly files, use the `tags` (plural) attribute when there is more than one tag specified. Use the `tag` (singular) attribute when there is only one tag. For example:
-+
-.Singular tagged module include syntax
-[source,text]
-====
-\include::modules/module-with-tag-filename.adoc[leveloffset=+1,tag=TagName]
-====
-+
-.Plural tagged module include syntax
-[source,text]
-====
-\include::modules/module-with-tags-filename.adoc[leveloffset=+1,tags=TagName;Mode1;!Mode2]
-====
-
-* In the module files, use `//` before the tag directives in asciidoc text and a `#` before tag directives in YAML. For example:
-+
-.Included file tag directives
-[source,text]
-----
-// tag::TagName[]
-== Tagging regions
-
-Tags are useful when you want to identify specific regions of a file to include. You can then select the lines between the boundaries of the include tag/end directives to include using the tags attribute.
-
-In the included file, the tag directives (e.g., tag::<tag_name>[] and end::<tag_name>[]) must follow a word boundary and precede a space character or the end of line. The tag name must not be empty and must consist exclusively of non-space characters.
-
-.Example CR
-[source,yaml]
---
-spec:
-# tag::Mode1[]
-    mode: openshift
-# end::Mode1[]
-# tag::Mode2[]
-    mode: openshift-network
-# end::Mode2[]
---
-// end::TagName[]
-----
-+
-[WARNING]
-====
-The use of a wildcard (`*`) is not fully supported by PV1. Verify that access.redhat.com builds and docs.openshift.com builds are including or excluding content as expected if you try to use them.
-====
-
-You can filter out the regions defined by a `tag` attribute by using link:https://docs.asciidoctor.org/asciidoc/latest/directives/include-tagged-regions/#tag-filtering[expressions] in place of or in conjunction with the tag name. If you add tag defined conditional content to a module with no existing tags, you must update existing includes of the file you are changing to exclude your content.
-
 == Writing concepts
 A _concept_ contains information to support the tasks that users want to do and
 must not include task information like commands or numbered steps. In most