Update comments

src/ui_interface.h

@@ -61,10 +61,10 @@ public:
     /** Show message box. */
     boost::signals2::signal<void (const std::string& message, const std::string& caption, int style)> ThreadSafeMessageBox;
 
-    /** Ask the user whether he want to pay a fee or not. */
+    /** Ask the user whether they want to pay a fee or not. */
     boost::signals2::signal<bool (int64 nFeeRequired, const std::string& strCaption), boost::signals2::last_value<bool> > ThreadSafeAskFee;
 
-    /** Handle an URL passed on the command line. */
+    /** Handle a URL passed at the command line. */
     boost::signals2::signal<void (const std::string& strURI)> ThreadSafeHandleURI;
 
     /** Progress message during initialization. */