GitLab Trademark Guidelines - Clarifications on accepted/prohibited use

Why is this change being made?

This MR proposes minor text changes to GitLab's Trademark Guidelines to clarify what is deemed acceptable use of the GitLab trademarks. Specifically, the updated language provides guidance on how to use the GITLAB mark in a business/brand/service/domain name etc. and explains that it isn't permitted to alter/distort/misappropriate the trademarks by combining with other content.

This updated language will provide clarity to those interested in making use of the GITLAB trademarks on how to do so in an acceptable/compliant manner.

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
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  • The when to get approval handbook section explains the workflow in more detail
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  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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