Typo fixes
diff --git a/Doc/lib/libcollections.tex b/Doc/lib/libcollections.tex
index d9bfa39..3e56a3e 100644
--- a/Doc/lib/libcollections.tex
+++ b/Doc/lib/libcollections.tex
@@ -59,12 +59,12 @@
\begin{methoddesc}{pop}{}
Remove and return an element from the right side of the deque.
- If no elements are present, raises a \exception{IndexError}.
+ If no elements are present, raises an \exception{IndexError}.
\end{methoddesc}
\begin{methoddesc}{popleft}{}
Remove and return an element from the left side of the deque.
- If no elements are present, raises a \exception{IndexError}.
+ If no elements are present, raises an \exception{IndexError}.
\end{methoddesc}
\begin{methoddesc}{remove}{value}