Clarification on Ring Usage in Linux Processes and System Calls Section 4.1 - Chapter 4

[srinathln7]

Current Text:
In Section 4.1, Paragraph 4, the book states, "Rings 2 and 3 are almost never used in practice." However, in Paragraph 1, it says, "Processes are run by and for users. Hence they're sometimes called 'userspace applications'. They have no special privileges, meaning they run in 'ring 3'."

Issue Description:
There seems to be a contradiction. Paragraph 4 should state that "Rings 1 and 2 are almost never used in practice" to align with the explanation in Paragraph 1.

Proposed Correction:
Change "Rings 2 and 3 are almost never used in practice" to "Rings 1 and 2 are almost never used in practice".

[tnballo]

Hey! Apologies for the delayed reply and thank you for catching this - you're right, "Rings 2 and 3 are almost never used in practice" should be updated to "Rings 1 and 2 are almost never used in practice" (off-by-one error!).

Would you like to submit a PR with the fix?