[needs-docs] Follow up UX fixes for moving custom function help

src/ui/qgsexpressionbuilder.ui

@@ -694,6 +694,9 @@ Change the name of the script and save to allow QGIS to auto load on startup.</s
            <property name="bottomMargin">
             <number>0</number>
            </property>
+           <item>
+            <widget class="QgsCodeEditorPython" name="txtPython" native="true"/>
+           </item>
            <item>
             <layout class="QHBoxLayout" name="horizontalLayout_5">
              <property name="sizeConstraint">
@@ -703,26 +706,9 @@ Change the name of the script and save to allow QGIS to auto load on startup.</s
               <number>0</number>
              </property>
              <item>
-              <widget class="QToolButton" name="btnRun">
-               <property name="toolTip">
-                <string>Run the current editor text in QGIS (also saves current script).
-
-Use this when testing your functions.
-
-Saved scripts are auto loaded on QGIS startup.</string>
-               </property>
+              <widget class="QLabel" name="lblAutoSave">
                <property name="text">
-                <string>Save and load functions</string>
-               </property>
-               <property name="icon">
-                <iconset resource="../../images/images.qrc">
-                 <normaloff>:/images/themes/default/mActionStart.svg</normaloff>:/images/themes/default/mActionStart.svg</iconset>
-               </property>
-               <property name="toolButtonStyle">
-                <enum>Qt::ToolButtonTextBesideIcon</enum>
-               </property>
-               <property name="autoRaise">
-                <bool>true</bool>
+                <string/>
                </property>
               </widget>
              </item>
@@ -743,17 +729,25 @@ Saved scripts are auto loaded on QGIS startup.</string>
               </spacer>
              </item>
              <item>
-              <widget class="QLabel" name="lblAutoSave">
+              <widget class="QPushButton" name="btnRun">
+               <property name="toolTip">
+                <string>Run the current editor text in QGIS (also saves current script).
+
+Use this when testing your functions.
+
+Saved scripts are auto loaded on QGIS startup.</string>
+               </property>
                <property name="text">
-                <string/>
+                <string>Save and Load Functions</string>
+               </property>
+               <property name="icon">
+                <iconset resource="../../images/images.qrc">
+                 <normaloff>:/images/themes/default/mActionStart.svg</normaloff>:/images/themes/default/mActionStart.svg</iconset>
                </property>
               </widget>
              </item>
             </layout>
            </item>
-           <item>
-            <widget class="QgsCodeEditorPython" name="txtPython" native="true"/>
-           </item>
            <item>
             <widget class="QgsCollapsibleGroupBox" name="groupBox">
              <property name="title">