docs: Added UNIX V10 Manuals

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+.UC
+.TH VALLOC 3
+.SH NAME
+valloc \- aligned memory allocator
+.SH SYNOPSIS
+.nf
+.B char *valloc(size)
+.B unsigned size;
+.fi
+.SH DESCRIPTION
+.I Valloc
+allocates
+.I size
+bytes aligned on a boundary adequate for
+.IR vread (2)).
+It is implemented by calling
+.IR malloc (3)
+with a slightly larger request, saving the true beginning of the block
+allocated, and returning a properly aligned pointer.
+.SH DIAGNOSTICS
+.I Valloc
+returns a null pointer (0) if there is no available memory
+or if the arena has been detectably corrupted by storing outside the bounds
+of a block.
+.SH BUGS
+.I Vfree
+isn't implemented.