docs: Changes "their" to "the" in 2 places

When referring to a client (piece of software), it's better not to use
a personified pronoun, such as "his" or "their". Changed to "the".

Change-Id: I5d79e70a9135d6f1e8da493fcdd50921b9696e31
Test: none (docs-only change)
Bug: 160937339