Fix some documentation typos. Add an empty line at the end of...

Fix some documentation typos. Add an empty line at the end of replayer_macros.tex to work around a bug in hevea's lstlisting implementation.

doc/replayer_macros.tex

@@ -12,4 +12,5 @@
 \newcommand{\explanation}[1]{\cellcolor{yellow!13}\textsl{#1}}
 
 \newcommand{\valid}[1]{\cellcolor{green!13}#1}
-\newcommand{\unknown}{\cellcolor{red!20}?}
\ No newline at end of file
+\newcommand{\unknown}{\cellcolor{red!20}?}
+

doc/syntaxref.tex

@@ -226,7 +226,7 @@ TODO: raise, try with end
 
 \subsubsection{Conditional expression, pattern matching}
 
-if then else. Discuss standar WP versus fast WP
+if then else. Discuss standard WP versus fast WP
 
 \subsubsection{Loops}
 
@@ -246,7 +246,7 @@ where \textsl{keyword} is either \texttt{assert}, \texttt{assume} or
 \item \texttt{check} requires to prove that the proposition holds, but
   does not make it visible in the remaining
 \item \texttt{assume} assumes that the proposition holds and make it
-  visible in the context of the remiaing code, without requiring to
+  visible in the context of the remaining code, without requiring to
   prove it. It acts like an axiom, but within a program.
 \end{itemize}
 The corresponding rules for computing WP are as follows: