hg: jdk/sandbox: 8224257: fix issues in files generated by pandoc

[chris.hegarty at oracle.com]

Changeset: ad4285992012
Author:    jjg
Date:      2019-05-30 10:37 -0700
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/ad4285992012

8224257: fix issues in files generated by pandoc
Reviewed-by: tbell, jjg, erikj
Contributed-by: jonathan.gibbons at oracle.com, erik.joelsson at oracle.com

! make/Docs.gmk
! make/Main.gmk
! make/ToolsJdk.gmk