RFR: Add info about MANPATH to README. [v2]

[Erik Helin]

On Mon, 29 Jun 2020 11:15:58 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Add info about MANPATH to README.
>
> Magnus Ihse Bursie has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Point user to build output instead of man page sources.

Looks good, just a minor comment inline.

README.md line 171:

> 170:
> 171: ```
> 172: echo "export MANPATH=\$MANPATH":$PWD/build/bin/man >> ~/.bashrc

Suggestion:


GitHub Flavored Markdown (and regular Markdown) support an [info string](https://github.github.com/gfm/#info-string)
after the opening code fence symbols (```). This info string is commonly used to describe the programming language used
in a code block (`bash` in this example). This enables for example syntax highlighting etc.

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/680