proper syntax highlighting in bazelrc

[nkoroste]

Description of the feature request:

The title says it all

Which category does this issue belong to?

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What underlying problem are you trying to solve with this feature?

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What operating system, Intellij IDE and programming languages are you using? Please provide specific versions.

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Have you found anything relevant by searching the web?

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Any other information, logs, or outputs that you want to share?

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