doc: fix typo in XRECVFROM command

[ru-fu]

Fix a typo in the example for the AT#XRECVFROM command.

Signed-off-by: Ruth Fuchss ruth.fuchss@nordicsemi.no

[didrikr]

While this will remove the reference to the non-existent #UDPRECVFROM command, the example does not match the syntax.
In the example: AT#UDPRECVFROM="test.server.com",1234
Syntax: #XRECVFROM[=<size>]
Which form is correct?

[ru-fu]

While this will remove the reference to the non-existent #UDPRECVFROM command, the example does not match the syntax.
In the example: AT#UDPRECVFROM="test.server.com",1234
Syntax: #XRECVFROM[=<size>]
Which form is correct?

@lats1980 @junqingzou ?

[lats1980]

Approve! Thanks for the fix. Please also change the syntax in the example.

[ru-fu]

Updated - please check again.

[junqingzou]

While this will remove the reference to the non-existent #UDPRECVFROM command, the example does not match the syntax.
In the example: AT#UDPRECVFROM="test.server.com",1234
Syntax: #XRECVFROM[=<size>]
Which form is correct?

@lats1980 @junqingzou ?

This was misunderstanding of UDP recvfrom() API in the beginning, that the remote host is the output instead of input of this API. Thus we removed the remote host in the command syntax. New syntax: #XRECVFROM[=<size>]