doc: Doc fixes for the change UART pins functionality

Doc fixes for the change UART pins PR.
PR #178

Signed-off-by: divya pillai <divya.pillai@nordicsemi.no>

Author: divipillai

doc/lib/sm_at_client.rst

@@ -55,7 +55,7 @@ The library sends the termination character automatically after an AT command.
 
 The application must configure the devicetree nodes for the UART, UART pins, and DTR GPIOs.
 
-Below is an example overlay for configuring UART and DTR/RI GPIOs with the `nrf54l15dk`_:
+The following is an example overlay for configuring UART and DTR/RI GPIOs with the `nrf54l15dk`_:
 
 .. code-block:: devicetree
 

doc/uart_configuration.rst

@@ -128,8 +128,8 @@ The following tables shows how to connect the UART pins to the corresponding pin
 
       .. note::
 
-         DTR and RI pins use the P0.31 and P0.30 pins, which are shared with the i2c2 instance on the `nrf9151dk`_ board.
-         i2c2 must stay disabled to use these pins for DTR and RI signals.
+         DTR and RI pins use the **P0.31** and **P0.30** pins, which are shared with the I2C2 instance on the `nrf9151dk`_ board.
+         I2C2 must stay disabled to use these pins for DTR and RI signals.
 
    .. group-tab:: Thingy:91 X with PC host