Add note where the scrollback files will be stored in KonsolePart apps

For the 'Use user specific location', any application using KonsolePart
will have the app name instead of konsole.

Example for yakuake: ~/.cache/yakuake

src/settings/FileLocationSettings.ui

@@ -159,6 +159,38 @@
         </item>
        </layout>
       </item>
+      <item>
+       <spacer name="verticalSpacer">
+        <property name="orientation">
+         <enum>Qt::Vertical</enum>
+        </property>
+        <property name="sizeType">
+         <enum>QSizePolicy::Fixed</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>20</width>
+          <height>30</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
+      <item>
+       <widget class="QLabel" name="label_2">
+        <property name="frameShape">
+         <enum>QFrame::NoFrame</enum>
+        </property>
+        <property name="frameShadow">
+         <enum>QFrame::Raised</enum>
+        </property>
+        <property name="text">
+         <string>For the 'Use user specific location', any application using KonsolePart will have the app name instead of konsole.</string>
+        </property>
+        <property name="wordWrap">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
       <item>
        <widget class="QLabel" name="label_2">
         <property name="font">