To Edit a Suffixes of Quotation on Web, please follow below mentioned Steps.
Step 1: Click on Document Settings, under Quotation.
Step 2: Click on Add Prefixes/Suffixes.
Step3: Click on Suffixes, slide to right and then click on Quotation.
Now click on Edit.
Step 4: Edit the Suffix and then click on Submit.
After that click on Update Settings.