Update hpmor-chapter-001.tex

chapters/hpmor-chapter-001.tex

@@ -212,7 +212,7 @@ \chapter{Tago de Tre Malgranda Probableco}
 % Patrino mentioned that you sent a Hogŭartso representative to Lili Potr (then Lili Evanz) in order to demonstrate to her family that magic was real, and, I presume, help Lili obtain her school materials.
 % If you could do this for my own family it would be extremely helpful.
 
-\letterClosing[Sincerely,]{Hari Ĝajmz Potr-Evanz-Veres.}
+\letterClosing[Sincere,]{Hari Ĝajmz Potr-Evanz-Veres.}
 \end{writtenNote}
 
 % Hari added their current address, then folded up la letter kaj put it in an envelope, which he addressed to Hogŭartso.