Clean substitutions

Author: DelazJ

docs/user_manual/introduction/browser.rst

@@ -687,16 +687,10 @@ Supported file types
    :width: 1.5em
 .. |settings| image:: /static/common/settings.png
    :width: 1.5em
-.. |sourceFields| image:: /static/common/mSourceFields.png
-   :width: 1.5em
 .. |spatialite| image:: /static/common/mIconSpatialite.png
    :width: 1.5em
 .. |stac| image:: /static/common/mIconStac.png
    :width: 1.5em
-.. |symbologyAdd| image:: /static/common/symbologyAdd.png
-   :width: 1.5em
-.. |symbologyRemove| image:: /static/common/symbologyRemove.png
-   :width: 1.5em
 .. |tiledSceneLayer| image:: /static/common/mIconTiledSceneLayer.png
    :width: 1.5em
 .. |unchecked| image:: /static/common/unchecked.png

docs/user_manual/working_with_vector/vector_properties.rst

@@ -4350,8 +4350,6 @@ To do so:
    :width: 1.5em
 .. |widgetRange| image:: /static/common/mEditorWidgetRange.png
    :width: 1.5em
-.. |widgetRelationEditor| image:: /static/common/mEditorWidgetRelationEditor.png
-   :width: 1.5em
 .. |widgetRelationReference| image:: /static/common/mEditorWidgetRelationReference.png
    :width: 1.5em
 .. |widgetSpacer| image:: /static/common/mEditorWidgetSpacer.png