Fix scountovf exception behavior in smcdeleg.adoc (#1612)

Fix bug, only get VIE on VS-mode reads, not VS-mode writes (which get IIE)

Signed-off-by: Beeman Strong <97133824+bcstrongx@users.noreply.github.com>

src/smcdeleg.adoc

@@ -130,7 +130,7 @@ raise a virtual instruction exception.
 === Virtualizing `scountovf`
 
 For implementations that support Smcdeleg/Ssccfg, Sscofpmf, and the H
-extension, when `menvcfg`.CDE=1, attempts to access `scountovf` from VS-mode
+extension, when `menvcfg`.CDE=1, attempts to read `scountovf` from VS-mode
 or VU-mode raise a virtual instruction exception.
 
 === Virtualizing Local Counter Overflow Interrupts