fix(PRU-ICSS): Convert literal blocks to code-blocks

[danish-ti]

This patch updates the PRU_ICSSG_Ethernet.rst and
PRU_ICSSG_Ethernet_Switch.rst documentation files to improve Sphinx compatibility and readability. The following changes are made:

• Replaces all occurrences of "::" used for literal/code blocks with ".. code-block:: console" and ensures proper indentation for code examples and command-line snippets.
• Updates all code and command output blocks to use the correct Sphinx directive, which enables syntax highlighting and consistent formatting in generated documentation.
• Fixes minor typos in comments and documentation text, such as correcting "Fore more details" to "For more details" and improving clarity.
• Ensures consistent formatting of code blocks, command outputs, and configuration examples throughout the documentation.
• No functional or content changes are made to the technical information; all updates are limited to documentation formatting and style.

[github-actions]

New warnings found with rstcheck:

source/linux/Foundational_Components/PRU-ICSS/Linux_Drivers/PRU_ICSSG_Ethernet_Switch.rst:38: (WARNING/2) Cannot analyze code. No Pygments lexer found for "console:".