Integrated: Added pandoc version recommendation

[Jesper Wilhelmsson]

On Wed, 16 Sep 2020 02:27:49 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> It was noted that pandoc 1.12.3.1 did not support all the flags we use in the build. V2.0 has all flags we use so I
> added a recommendation to use at least that version.

This pull request has now been integrated.

Changeset: 62ad61b7
Author:    Jesper Wilhelmsson <jwilhelm at openjdk.org>
URL:       https://git.openjdk.java.net/guide/commit/62ad61b7
Stats:     1 line in 1 file changed: 0 ins; 0 del; 1 mod

Added pandoc version recommendation

Reviewed-by: iris

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PR: https://git.openjdk.java.net/guide/pull/27