Doc: Add missing qualifiers to \fn arguments


QWebView has documentation for its signals and slots, but the \fn
topics were missing a QWebView:: qualifier.

Pick-to: 6.12
Change-Id: I01cedc3b15e04d4f6e24d6580bde14a23fd85a75
Reviewed-by: Jerome Pasion <jerome.pasion@qt.io>
commita101c580de6f192904effefe3ad1dee6cf0a85f5
parentff88a5a7ada086f2333569623a1b14cc5f9d2f7c
authorTopi Reinio <topi.reinio@qt.io>
committerTopi Reinio <topi.reinio@qt.io>
commit timeTue, 16 Jun 2026 10:15:04 +0000