bpf, docs: Editorial nits in instruction-set.rst

This patch addresses a number of editorial nits including
spelling, punctuation, grammar, and wording consistency issues
in instruction-set.rst.

Signed-off-by: Dave Thaler <dthaler1968@gmail.com>
Acked-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20240405155245.3618-1-dthaler1968@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>