fix typo in language spec

documentation/src/reference/ReferencePart.tex

@@ -540,7 +540,7 @@ \subsubsection*{Multi-Line String Literals}
 
 A multi-line string literal is a sequence of characters enclosed in
 triple quotes ~\lstinline@""" ... """@. The sequence of characters is
-arbitrary, except that it may contain three or more consuctive quote characters
+arbitrary, except that it may contain three or more consecutive quote characters
 only at the very end. Characters
 must not necessarily be printable; newlines or other
 control characters are also permitted.  Unicode escapes work as everywhere else, but none