fix(macro): fix syntax error for #[php_class] with multiline doc comments

[Xenira]

Refs: #467

[coveralls]

Pull Request Test Coverage Report for Build 15783814579

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 22.034%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
crates/macros/src/class.rs	0	1	0.0%

Totals
Change from base Build 15715478100:	0.0%
Covered Lines:	871
Relevant Lines:	3953

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💛 - Coveralls

[Xenira]

@kakserpom can you check if this fixed it for you?

[kakserpom]

@Xenira yes, it did.