Correct example property syntax under ScriptPatternSelector

[martin-dorey-hv]

Fixes #3078

Attempting to do as requested in #3078 (comment) for @ppkarwasz.

Checklist

Just excuses here, I'm afraid:

Base your changes on 2.x branch if you are targeting Log4j 2; use main otherwise

I don't know what I'm doing wrt branches, here or otherwise, I'm afraid.

./mvnw verify succeeds (if it fails due to code formatting issues reported by Spotless, simply run ./mvnw spotless:apply and retry)

Java 17 would be tricky.

Non-trivial changes contain an entry file in the src/changelog/.2.x.x directory

I'm hoping it's regarded as trivial.

Tests for the changes are provided

Yeah, I didn't do that, but apparently the examples aren't tested, so that's not a regression.

Commits are signed (optional, but highly recommended)

I don't have that set up.

[github-actions]

Job	Requested goals	Build Tool Version	Build Outcome	Build Scan®
build-macos-latest	clean install	3.9.8	✅
build-ubuntu-latest	clean install	3.9.8	✅
build-windows-latest	clean install	3.9.8	✅

Generated by gradle/develocity-actions

[ppkarwasz]

LGTM, thanks!

[ppkarwasz]

@martin-dorey-hv,

Thanks for your PR, your changes should be already online.