HIP documentation update for clarity on definition

[saadrahim]

Associated JIRA ticket number/Github issue number

What type of PR is this? (check all applicable)

• [ ] Refactor
• [ ] Feature
• [ ] Bug Fix
• [ ] Optimization
• [x] Documentation Update
• [ ] Continuous Integration

What were the changes?

Drop references to our competitor's GPUs

Why are these changes needed?

Clarity

Updated CHANGELOG?

• [ ] Yes
• [x] No, Does not apply to this PR.

Added/Updated documentation?

• [x] Yes
• [ ] No, Does not apply to this PR.

Additional Checks

• [ ] I have added tests relevant to the introduced functionality, and the unit tests are passing locally.
• [ ] Any dependent changes have been merged.