documentation:intro: fix typos and grammar

[Quin-Darcy]

This pull request makes several corrections and improvements to the Documentation/teaching/lectures/intro.rst file, focusing on grammar, clarity, and accuracy. The changes include fixing typos, improving phrasing, and correcting technical terminology.

Grammar and Typographical Fixes:

• Corrected "each-other" to "each other" and improved phrasing in the description of micro-kernels ([Documentation/teaching/lectures/intro.rstL187-R190](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L187-R190)).
• Fixed "other then" to "other than" in the discussion of hybrid kernels ([Documentation/teaching/lectures/intro.rstL272-R272](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L272-R272)).
• Corrected "Security Enhancened Linux" to "Security Enhanced Linux" in the Linux Security Modules section ([Documentation/teaching/lectures/intro.rstL1160-R1160](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L1160-R1160)).

Technical and Terminology Clarifications:

• Improved phrasing in the description of kernel space and user space, such as changing "accessed protected" to "access protected" ([Documentation/teaching/lectures/intro.rstL73-R73](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L73-R73)).
• Clarified the description of device drivers, changing "responsible of" to "responsible for" and fixing other minor phrasing issues ([Documentation/teaching/lectures/intro.rstL122-R122](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L122-R122)).

List and Syntax Adjustments:

• Added missing conjunctions and punctuation in lists, such as "SL*B and CMA allocators" ([[1]](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L781-R781)) and "message queues, semaphores, shared memory" ([[2]](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L771-R771)).
• Fixed list formatting issues, such as correcting "Components can enabled or disabled" to "Components can be enabled or disabled" ([Documentation/teaching/lectures/intro.rstL258-R258](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L258-R258)).

Improved Consistency:

• Standardized terminology across the document, e.g., ensuring consistent use of "filesystem" instead of "fileystem" ([Documentation/teaching/lectures/intro.rstL931-R931](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L931-R931)).
• Improved clarity in descriptions, such as rephrasing "differently than other kernels" for better readability ([Documentation/teaching/lectures/intro.rstL955-R955](https://github.com/linux-kernel-labs/linux/pull/418/files#diff-714ddd6957bcc25c7613321d1c2f9a2e4f62f2396c6b54ebb3adf626cf6cae41L955-R955)).