strbuf.h: format asciidoc code blocks as 4-space indent
This is much easier to read when the whole thing is stuffed inside a comment block. And there is precedent for this convention in markdown (and just in general ascii text). Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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