Doc: Describe setting the toolbar style

In Preferences > Environment > Interface > Toolbar style.

Task-number: QTCREATORBUG-28996
Change-Id: Ia382f506432bf1b0a499df5c168d5bc3b69477bc
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

doc/qtcreator/src/editors/creator-coding-edit-mode.qdoc

@@ -29,6 +29,12 @@
 
     \if defined(qtcreator)
     \image qtcreator-editortoolbar-symbols.webp {Edit mode toolbar}
+
+    To add more space around the toolbar items, select \uicontrol Edit >
+    \uicontrol Preferences > \uicontrol Environment > \uicontrol Interface, and
+    then select \uicontrol Relaxed in the \uicontrol {Toolbar style} field.
+
+    \image qtcreator-preferences-environment-interface.webp {Interface tab in Environment preferences}
     \else
     \image studio-edit-mode.png
     \endif

doc/qtcreator/src/howto/creator-keyboard-shortcuts.qdoc

@@ -58,7 +58,7 @@
     in context menus} check box indicates whether the platform default value
     is \c on or \c off.
 
-    \image qtcreator-options-environment-interface.png "Interface tab in the Environment preferences"
+    \image qtcreator-preferences-environment-interface.webp {Interface tab in Environment preferences}
 
     \section1 Configuring Keyboard Shortcuts
 

doc/qtcreator/src/user-interface/creator-ui.qdoc

@@ -143,7 +143,7 @@
     > \uicontrol Environment, and then select a theme in the \uicontrol Theme
     field.
 
-    \image qtcreator-options-environment-interface.png "Interface preferences"
+    \image qtcreator-preferences-environment-interface.webp {Interface preferences}
 
     \section1 Changing Languages
 
@@ -452,7 +452,7 @@
     \uicontrol Preferences > \uicontrol Environment > \uicontrol Interface, and
     then select the codec in the \uicontrol {Text codec for tools} field.
 
-    \image qtcreator-options-environment-interface.png "Interface tab in the Environment preferences"
+    \image qtcreator-preferences-environment-interface.webp {Interface tab in Environment preferences}
 
     \section1 Finding and Filtering Output