Name the string heap (#179)

Author: GabrielDosReis

ltx/heaps.tex

@@ -82,3 +82,5 @@ \subsection{String heap}
 
 The string heap is a partition consisting entirely of \type{TextOffset} values.  Each entry in that
 heap designates a NUL-terminated UTF-8 encoded string (\secref{sec:ifc-textoffset-data-type}).
+
+\partition{heap.string}