docs: correct description of multiline patterns usage based on #1353

[tatomyr]

What/Why/How?

The description was not quite correct. Fixed based on #1351 (kudos to @jeremyfiel!).

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Latest commit: 1a7b7bd

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.073 ± 0.041	1.038	1.180	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.073 ± 0.015	1.054	1.096	1.00 ± 0.04

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	76.31%	4100/5373
🟡	Branches	66.29%	2183/3293
🟡	Functions	68.42%	663/969
🟡	Lines	76.51%	3847/5028

Test suite run success

653 tests passing in 94 suites.

Report generated by 🧪jest coverage report action from 1a7b7bd

[lornajane]

Thank you for getting deep into this and sorting out the details!

[lornajane]

Suggested change

	Use the [double-quotated style](https://yaml.org/spec/1.2.2/#731-double-quoted-style) or take account of this in your pattern.
	Use the [double-quoted style](https://yaml.org/spec/1.2.2/#731-double-quoted-style) or take account of this in your pattern.