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blk: explain why we want 2 passes when allocing a block

--- a/blk.c

+++ b/blk.c

@@ -563,6 +563,12 @@

 	tries = 0;

 Again:

 	a = pickarena(ty, hint, tries);

+	/*

+	 * Loop through the arena up to 2 times.

+	 * The first pass tries to find an arena

+	 * that has space and is not in use, the

+	 * second waits until an arena is free.

+	 */

 	if(tries == 2*fs->narena)

 		error(Efull);

 	tries++;