RFR: JDK-8272667: substandard error messages from the docs build

[Iris Clark]

On Wed, 18 Aug 2021 22:06:13 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a small (delete one character) change to improve the error messages reported when bad HTML is detected when post-processing the output from pandoc to generate the docs.
> 
> The change is just to pass the filename as an argument to the command, instead of just piping the input to stdin. As a result, the name of any file containing bad input is reported in the message, instead of the message simply referring to `<stdin>`

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5175