Remove stray backtick to preserve md format

This fixes formatting for last third of document in markdown viewers.

Change-Id: I499d1c35478aa97a43682d7f6ba89d8e2cd691cc

docs/kelvin_isa.md

diff --git a/docs/kelvin_isa.md b/docs/kelvin_isa.md
index a623ffb..2c9cb28 100644
--- a/docs/kelvin_isa.md
+++ b/docs/kelvin_isa.md
@@ -1962,7 +1962,7 @@
 vsubw.[h,w].{u}.vv.{m} vd, vs1, vs2 \
 vsubw.[h,w].{u}.vx.{m} vd, vs1, xs2
 
-**Operation**`
+**Operation**
 
 ```
 for L in Op.typelen