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Only set %%PORTDOCS%%/%%PORTEXAMPLES%% if a DOCS/EXAMPLES option is defined.

Description

Only set %%PORTDOCS%%/%%PORTEXAMPLES%% if a DOCS/EXAMPLES option is defined.

PR: 230864
Submitted by: mat
exp-runs by: antoine
Differential Revision: https://reviews.freebsd.org/D13651