docs: update respect server option docs

[DmitryAnansky]

What/Why/How?

Update respect server option docs with multiple servers override example as it was not clear for users.

Reference

Closes: #2027 (comment)

Testing

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Check yourself

• Code changed? - Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests
• New package installed? - Tested in different environments (browser/node)

Security

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: b9831f8

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[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	998.2 ± 16.8	978.2	1020.5	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1001.1 ± 30.5	975.0	1068.2	1.00 ± 0.03

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	79.48%	7070/8895
🟡	Branches	68.53%	2947/4300
🟡	Functions	75.18%	1154/1535
🟡	Lines	79.87%	6745/8445

Test suite run success

1344 tests passing in 194 suites.

Report generated by 🧪jest coverage report action from b9831f8