Fixes a discrepancy in UpdatePath readme (#70939)
Fixes a discrepancy in UpdatePath readme (#70939)

## About The Pull Request
The recent overhaul of UpdatePath's documentation contains a
discrepancy. Currently, it mentions that the line
`/mob/living/basic/mouse{name="Tom"} : /mob/living/basic/mouse/tom{name
= @SKIP, @OLD}` will keep all the old variables except for 'name'. This
format is slightly incorrect, and will actually cause the UpdatePaths
script to error and not complete its task at all.

By cross-referencing some pre-existing scripts in the folder, as well as
actual testing, the correct way to write this would be the following:
`/mob/living/basic/mouse{name="Tom"} :
/mob/living/basic/mouse/tom{@OLD;name=@SKIP}`

Note the use of a semi-colon instead of the comma, the removal of
spaces, and the use of `@OLD` _before_ `@SKIP`. **Each of these cases
are important and affect the outcome/success of the script!**
Bawhoppen/-tg-station,Bawhoppen/-tg-station,tgstation/tgstation,tgstation/tgstation,Bawhoppen/-tg-station,tgstation/tgstation,tgstation/tgstation,tgstation/tgstation,Bawhoppen/-tg-station,tgstation/tgstation,Bawhoppen/-tg-station,Bawhoppen/-tg-station,tgstation/tgstation,Bawhoppen/-tg-station,tgstation/tgstation,Bawhoppen/-tg-station