Small edits

paper/rfc.tex

@@ -91,8 +91,8 @@ the RFC uses an additional variable to decide whether a conditional swap
 is required or not.
 
 Later in our proof we use a simpler description of the ladder
-(\coqe{montgomery_rec}), which strictly follows \aref{alg:montgomery-ladder},
-and prove those ladders equivalent.
+(\coqe{montgomery_rec}) which strictly follows \aref{alg:montgomery-ladder}
+and prove those descriptions equivalent.
 
 RFC 7748 describes the calculations done in X25519 as follows:
 \emph{``To implement the X25519(k, u) [...] functions (where k is