Apply suggestion from @MarkusLassila

Co-authored-by: Markus Lassila <markus.lassila@nordicsemi.no>

Author: trantanen

doc/migration_notes.rst

@@ -58,7 +58,8 @@ The following changes are mandatory to make your application work in the same wa
    * PPP connection must be requested with ``AT#XPPP=1`` in order to get it started when modem is put to online mode with ``AT+CFUN=1``.
      ``AT#XPPP=1`` can be done before or after ``AT+CFUN=1``.
      So PPP connection is not started automatically anymore when ``AT+CFUN=1`` is done.
-     However, ``AT#XPPP=1`` needs to be done only once and after that PPP is started when ``AT+CFUN=1`` is done and stopped when ``AT+CFUN=4`` or ``AT+CFUN=0`` is done.
+     When ``AT#XPPP=1`` is done, the PPP connection is started when ``AT+CFUN=1`` is done and stopped when network is lost, for example with ``AT+CFUN=4`` or ``AT+CFUN=0``.
+     When ``AT#XPPP=0`` is done, PPP connection is stopped permanently.
 
 DTR and RI GPIOs replace Power and Indicate pins
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