Update references to stylepedia.net in the IBM style guide

[rclee33]

There might be a plan for this already, but in case there’s not — the IBM Style Guide mentions and links to the Red Hat writing guide at stylepedia.net. After the Red Hat guide migrates to redhat.com, these mentions and links will need to be updated.

For example, from the “Red Hat versus IBM conventions for style” section: https://www.ibm.com/docs/en/ibm-style?topic=medium-red-hat

Mentions: Red Hat writing style > second bulleted list "Stylepedia supersedes IBM Style in the event of any contradictions:" "- Red Hat Technical Writing Style Guide at stylepedia.net" "- IBM Style for any topics not covered in the Stylepedia guide"

Embedded links: Related resources > Red Hat Technical Writing Style Guide [embedded link] at stylepedia.net