improve GOMEMLIMIT description

[dudanogueira]

What's being changed:

The suggested value for GOMEMLIMIT is between 90% and 80% of your total memory.

Note: some edge cases could benefit from different values.

Type of change:

• Documentation updates (non-breaking change to fix/update documentation)
• Website updates (non-breaking change to update main page, company pages, pricing, etc)
• Content updates – blog, podcast (non-breaking change to add/update content)
• Bug fix (non-breaking change to fixes an issue with the site)
• Feature or enhancements (non-breaking change to add functionality)

How Has This Been Tested?

• GitHub action – automated build completed without errors
• Local build - the site works as expected when running yarn start

note, you can run yarn verify-links to test site links locally