Document sqlite3_wal_hook() return.

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manifest.uuid

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src/sqlite.h.in

@@ -9031,8 +9031,9 @@ void sqlite3_log(int iErrCode, const char *zFormat, ...);
 **
 ** A single database handle may have at most a single write-ahead log callback 
 ** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
-** previously registered write-ahead log callback. ^Note that the
-** [sqlite3_wal_autocheckpoint()] interface and the
+** previously registered write-ahead log callback. ^The return value is
+** a copy of the third parameter from the previous call, if any, or 0.
+** ^Note that the [sqlite3_wal_autocheckpoint()] interface and the
 ** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
 ** overwrite any prior [sqlite3_wal_hook()] settings.
 */