Update manual about the default value of -T#/--threads=#
#4474
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The section about
ZSTD_NBTHREADSalready explains the default number of threads, since it changed from 1 (commit 17beeb5). But the option description for-T#/--threads=#incorrectly said the default was still 1.I noticed this when I found compression slower with
-T1than without it.