Add inertially to the spelling wordlist (#1450)

# Description

@swift-nav/algint-team

Added `inertially` to the spelling worldlist

# API compatibility

Does this change introduce a API compatibility risk?

No

## API compatibility plan

If the above is "Yes", please detail the compatibility (or migration)
plan:

N/A

# JIRA Reference

https://swift-nav.atlassian.net/browse/BOARD-XXXX

Author: Madhunika-atmakuri

python/docs/source/spelling_wordlist.txt

@@ -81,6 +81,7 @@ hydrostatic
 ifaddrs
 imu
 incrementing
+inertially
 infofirmware
 interoperable
 io