Fix header links with underscores in title.

[bitsondatadev]

The current link fails for the current site: https://iceberg.apache.org/docs/latest/spark-procedures/#expire-snapshots

The reason my linkchecker missed this was that it still loads the page just not the link. So we'll need to do a pass at these in a later PR.

[raghits]

@bitsondatadev looks like https://iceberg.apache.org/docs/latest/spark-procedures/#expire_snapshots is valid URL. Should we use _ underscore instead of hyphen - for these links?

[bitsondatadev]

To keep compatibility with the old site, we should support both. The only time this becomes an issue is if you have a saved link (or Google in the short term) but using the - will still take you to the page, just not the header.

For now use _ and if there becomes a real need we'll implement it.

[raghits]

Thanks. Sounds good. Also, looks like all procedure names have a _ separator. So it would be consistent with that convention.

[bitsondatadev]

Thanks for this @raghits, have you noticed any other header not using the underscore?

I haven't checked myself.

[raghits]

@bitsondatadev here are the references where the hyphen (expire-snapshots) is used but those URLs valid and hence I didn't update it: https://github.com/apache/iceberg/blob/main/docs/docs/spark-structured-streaming.md https://github.com/apache/iceberg/blob/main/docs/docs/flink-writes.md

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