chore: update error messages

[tatomyr]

What/Why/How?

Updated a couple of error messages to make the format more consistent.
We don't need the extra lines as the exitWithError function already adds them.

Also corrected the wrong url: https://github.com/Redocly/redocly-cli/pull/1571/files#diff-2fb448d11702324cc59d657d5945d59cd325540eb87b71f2e66a5bc01ada834cR730

Reference

Testing

Screenshots (optional)

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]

🦋 Changeset detected

Latest commit: b2761fe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@redocly/cli	Patch
@redocly/openapi-core	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	987.0 ± 22.0	965.7	1028.0	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1000.9 ± 17.0	977.0	1029.8	1.01 ± 0.03

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	77.25%	4481/5801
🟡	Branches	67.48%	2467/3656
🟡	Functions	70.86%	744/1050
🟡	Lines	77.43%	4214/5442

Test suite run success

735 tests passing in 102 suites.

Report generated by 🧪jest coverage report action from b2761fe

[lornajane]

Minor thing, also I suggest we add a changelog here despite it being a chore. It wouldn't be too surprising if people were matching error messages in their own code, so we should probably let them know that they might see a change.