HDDS-5189. fix markdown files to make them hugo83 compatible (and valid)

[elek]

What changes were proposed in this pull request?

Hugo 0.83 is reported to be failing while generating Ozone docs. See https://issues.apache.org/jira/browse/HDDS-5189 for more details.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-5189

How was this patch tested?

./hadoop-ozone/dev-support/checks/docs.sh

• full ci test on my fork

[adoroszlai]

Thanks @elek for finding the root cause. It looks like some extra whitespace is still leftover.

[adoroszlai]

There are a number of closing ``` markers with indentation, which do not end the code section.

[elek]

Good point.

This is the result when I use IDE instead of CLI ;-) Fixed now with

sed -i -E 's/[[:space:]]+```/```/g' ReconApi.zh.md`

But after I tested with hugo serve I found that the rendering still not perfect. Section titles are hard to identify/read:

Here it's not clear that 'containers/unhealthy is a section title'

https://ozone.apache.org/docs/1.1.0/interface/reconapi.html

I fixed this styling, too. And now it seems to be more readable:

[vivekratnavel]

+1 LGTM.

[vivekratnavel]

@elek Thanks for working on this and @adoroszlai for the review and contribution.