Update doc with 4.0 information. (#2795)

Author: janiversen

doc/index.rst

@@ -20,6 +20,5 @@ Please select a topic in the left hand column.
    source/authors
    source/changelog
    source/internals
-   source/roadmap
 
 .. include:: ../README.rst

doc/source/_static/examples.tgz

@@ -4,46 +4,4 @@ Pymodbus 4.0 upgrade procedure
 Pymodbus 4.0 contains a number of incompatibilities with Pymodbus 3.x, however
 most of these are simple edits.
 
-Python 3.9
-----------
-Python 3.9 is reaching end of life and from october 2025 no longer receives security updates.
-
-Pymodbus starting with v4.0 start using python 3.10 features, and thus users need to update to
-at least python v3.10
-
-Users that cannot upgrade the python version, should not upgrade pymodbus to v4.X
-
-
-Start<x>Server
---------------
-custom_funcion= is changed to custom_pdu= and is handled by Modbus<x>Server.
-
-
-payload classes removed
------------------------
-Please replace by result.convert_from_registers() and/or convert_to_registers()
-
-
-Simple replacements
--------------------
-
-please replace parameters as follows
-
-- slave= with device_id=
-- slaves= with device_ids=
-- ModbusServerContext(slaves=) with ModbusServerContext(devices=)
-
-please rename classes/methods as follows
-
-- ModbusSlaveContext to ModbusDeviceContext
-- RemoteSlaveContext to RemoteDeviceContext
-- report_slave_id to report_device_id
-- diag_read_slave_message_count with diag_read_device_message_count
-- diag_read_slave_no_response_count with diag_read_device_no_response_count
-- diag_read_slave_nak_count with diag_read_device_nak_count
-- diag_read_slave_busy_count with diag_read_device_busy_count
-- ReturnSlaveMessageCountRequest with ReturnDeviceMessageCountRequest
-- ReturnSlaveNoResponseCountRequest with ReturnDeviceNoResponseCountRequest
-- ReturnSlaveNAKCountRequest with ReturnDeviceNAKCountRequest
-- ReturnSlaveBusyCountRequest with ReturnDeviceBusyCountRequest
-- ReturnSlaveBusCharacterOverrunCountRequest with ReturnDeviceBusCharacterOverrunCountRequest
+**This will be amended, whenever there API changes are merged**