bpo-44345: Fix comment in parser.c

[anonaka]

Fix the first line comment in parser.c

https://bugs.python.org/issue44345

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

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@anonaka

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[anonaka]

I have just signed the CLA.

[nanjekyejoannah]

Its not showing yet that you signed CLA but I think it will with time.

[nanjekyejoannah]

I will let @lysnikolaou merge this one.

[lysnikolaou]

Looks good. Congrats @anonaka on your first contribution!

[lysnikolaou]

I'm gonna go ahead and merge this without the CLA label change, since it's a small change.