Documentation/gitformat-pack.txt: fix incorrect MIDX documentation

Back in 32f3c541e3 (multi-pack-index: write pack names in chunk, 2018-07-12) the MIDX's "Packfile Names" (or "PNAM", for short) chunk was described as containing an array of string entries. e0d1bcf825 notes that this is the only chunk in the MIDX format's specification that is not guaranteed to be 4-byte aligned, and so should be placed last. This isn't quite accurate: the entries within the PNAM chunk are not guaranteed to be 4-byte aligned since they are arbitrary strings, but the chunk itself is 4-byte aligned since the ending is padded with NUL bytes. That padding has always been there since 32f3c541e3 via midx.c::write_midx_pack_names(), which ended with: i = MIDX_CHUNK_ALIGNMENT - (written % MIDX_CHUNK_ALIGNMENT) if (i < MIDX_CHUNK_ALIGNMENT) { unsigned char padding[MIDX_CHUNK_ALIGNMENT]; memset(padding, 0, sizeof(padding)) hashwrite(f, padding, i); written += i; } In fact, 32f3c541e3's log message itself describes the chunk in its first paragraph with: Since filenames are not well structured, add padding to keep good alignment in later chunks. So these have always been externally aligned. Correct the corresponding part of our documentation to reflect that. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>