Small typo on document

[seal2002]

Hello,

I found a small typo on this document

https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#missing-section-headers-enforced-for-api-level-24

It should be headers, not header

`C:/DevTools/android-sdk/ndk/26.1.10909125/toolchains/llvm/prebuilt/windows-x86_64/bin/llvm-readelf.exe: error: unknown argument '--header', did you mean '--headers'?`

Cheers

[enh]

interestingly gnu readelf accepts both --header and --headers, but
llvm-readelf only accepts --headers. i'll update the doc to use
--headers since that (a) works everywhere and (b) is a bit more
logical anyway [https://android-review.googlesource.com/c/platform/bionic/+/2961462],
but i'll pass this on to the llvm team too, since this seems like a
trivial llvm-readelf bug to fix for better compatibility...

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[enh]

(for the record, gnu readelf seems to accept any unique prefix, so
`--heade`, `--head`, `--hea` all work too, before `--he` collides with
`--help :-) )