documentation:kernel_modules: fix typos and grammar

[Quin-Darcy]

This pull request focuses on improving the clarity and accuracy of the Documentation/teaching/labs/kernel_modules.rst file. The changes primarily involve fixing typographical errors, improving grammar, and ensuring consistency in formatting and terminology.

Typographical and grammatical corrections:

• Corrected "writting" to "writing" in the hint about setting the console log level.
• Replaced "an user program" with "a user program" for grammatical correctness.
• Changed "providing the possibility" to "providing the ability" for better readability.
• Reworded "Until the release of those references" to "Until those references are released" for improved clarity.

Terminology and formatting improvements:

• Standardized the use of := in Kbuild file examples for consistency. [1] [2]
• Updated "loadable kernel mode" to "loadable kernel module" for accuracy.
• Replaced "simple and quick way" with "simple and quick method" to improve phrasing.
• Adjusted phrasing to use "ability to perform live debugging" instead of "possibility to perform live debugging."

Punctuation adjustments:

• Replaced a semicolon with an em dash for better sentence flow in an explanation about storing values in memory.
• Added a comma for clarity in a sentence about system freezes and logs.