Documentation/riscv: Improve `index.md`

1.  Add dot/period to the end of sentences
2.  Remove blank line at the end of the file
3.  Break lines after 75 characters
4.  Use RISC-V spelling
5.  Add comma for clarity

Change-Id: Icbe803dfbe92ca7850204a1a9f7175befe9c8bcf
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-on: https://review.coreboot.org/28654
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Philipp Hug <philipp@hug.cx>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions