related fdo#62879 replace "section" in dialog for read-only content

because the dialog is not specific for sections

Change-Id: I07b127a315ea7122aa37d64461b9b0271a52c754
Reviewed-on: https://gerrit.libreoffice.org/13347Reviewed-by: Wesley J. Landaker <wjl@icecavern.net>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/uiconfig/swriter/ui/inforeadonlydialog.ui

@@ -10,7 +10,7 @@
     <property name="type_hint">dialog</property>
     <property name="skip_taskbar_hint">True</property>
     <property name="buttons">ok</property>
-    <property name="text" translatable="yes">Write-protected sections cannot be changed.</property>
+    <property name="text" translatable="yes">Write-protected content cannot be changed.</property>
     <property name="secondary_text" translatable="yes">No modifications will be accepted.</property>
     <child internal-child="vbox">
       <object class="GtkBox" id="messagedialog-vbox">