cmake: remove duplicate home directry from documentation

Merged Darryl Green requested to merge github/fork/masahisak/remove_duplicate_homedirectory into master

Created by: masahisak

Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org Change-Id: I04b20aacd18378b728b8dbfd0e605f42ad78e50d

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