docs: memory-hotplug: fix typo 'fo' -> 'for' in NODE_ADDED_FIRST_MEMORY description
The description of NODE_ADDED_FIRST_MEMORY notification contains
a missing 'r' in the word 'for'. Fix the typo.
Signed-off-by: Praveen Kumar Singh <pr4veensingh@proton.me>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <by7jSPCep0WcWKD6nntH0wGbcN59hRhsEOc2lHBps2QizxRtedH25CdW8DO33YiqJU3Y7kGWesJnBts-jvgMzNqDvLWH3cTDYpJPuNed9hU=@proton.me>
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