mktmpdir: refer to docs

Manual BUILDDIR specification isn't exactly obvious from this script (aiming to derive it automatically), so at least point those interested at QUICKSTART they might have long forgotten already or, gasp, not even started reading.

mktmpdir: refer to docs
b3caf70f · Michael Shigorin · a65c3f27 · b3caf70f
Commit b3caf70f authored Dec 26, 2016 by Michael Shigorin
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mktmpdir bin/mktmpdir +2 -0

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--- a/bin/mktmpdir
+++ b/bin/mktmpdir
@@ -2,6 +2,8 @@
 # analyze free space, preferring tmpfs over really many gigaz
 # and taking into account configured hasher workdir prefices

+# NB: use BUILDDIR to override autodetection (see ../QUICKSTART)
+
 # hope there aren't spaces in RM's $HOME are they?
 DIRS="$TMP $TMPDIR $HOME/hasher /tmp /var/tmp .."
 MINSIZE=262144		# face control criterion