Updated migrating-from-msword.adoc to pandoc 2.0

[abelsromero]

Related to https://github.com/asciidoctor/asciidoctor.org/issues/542

This PR:

• Removes the --normalize flag, no longer necessary
• Updates tested on software
• Added information about links compatibility
• Added link to @Mogztter GitHub on mention
• Fixed a couple of typos
• Removes unused attribute uri-ant

[mojavelinux]

Thanks so much, @abelsromero!