docs(astro): Elaborate on custom config paths

[s1gr1d]

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The current wording might be a bit confusing, so the wording was changed slightly to make sure it's not needed to add the file paths in a default setup.

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Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) :arrow_down:. This is within the configured threshold :white_check_mark:

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	7.37MB	6 bytes (-0.0%) :arrow_down:
sentry-docs-edge-server-array-push	333.11kB	3 bytes (-0.0%) :arrow_down:
sentry-docs-client-array-push	6.44MB	6 bytes (-0.0%) :arrow_down:

[Lms24]

thanks for clarifying!