[Qt] Improve progress display during headers-sync and peer-finding

src/qt/clientmodel.h

@@ -66,7 +66,7 @@ public:
 
     //! Return true if core is doing initial block download
     bool inInitialBlockDownload() const;
-    //! Return true if core is importing blocks
+    //! Returns enum BlockSource of the current importing/syncing state
     enum BlockSource getBlockSource() const;
     //! Return true if network activity in core is enabled
     bool getNetworkActive() const;