Docs: Musca-S1 documentation clarification

In the documentation, clarifies the location where the code runs from.
(embedded flash -> eMRAM)

Signed-off-by: Dávid Házi <david.hazi@arm.com>
Change-Id: Ib44ce5da02cb8e6e0890fde0b20c51de96f33b53
1 file changed