Removes two links to the yaml spec as the site is down

[HCloward]

What/Why/How?

I don't know how long the site has been down or when it might be back up, but for now it is breaking our preview builds on the Marketing site so I am removing these links.

Testing

I ran mlc locally and it has fixed the errors.

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: a484c00

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.013 ± 0.049	0.964	1.145	1.02 ± 0.05
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	0.996 ± 0.016	0.970	1.026	1.00

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	76.67%	4390/5726
🟡	Branches	66.99%	2358/3520
🟡	Functions	70.17%	722/1029
🟡	Lines	76.84%	4121/5363

Test suite run success

716 tests passing in 101 suites.

Report generated by 🧪jest coverage report action from a484c00