Fix UI description in volume snapshot class
Created by: Bettygogo2021
Signed-off-by: Bettygogo2021 91529409+Bettygogo2021@users.noreply.github.com What type of PR is this? /kind documentation
What this PR does / why we need it: Fix a grammar issue in the description.
Special notes for reviewers: /assign @harrisonliu5
Please take a look. Thanks!
Does this PR introduce a user-facing change?
None