Fix two minor typos

chapters/scoping.tex

@@ -159,10 +159,10 @@ \section{Instance Hierarchy Name Lookup of Inner Declarations}\label{instance-hi
 
 If the outer component declaration is a disabled conditional component (\cref{conditional-component-declaration}) it is also ignored for the automatic creation of inner component (neither causing it; nor influencing the type of it).
 
-An \lstinline!outer! element reference in a simulation model requires that one corresponding \lstinline!inner! element declaration exist or can be created in a unique way:
+An \lstinline!outer! element reference in a simulation model requires that one corresponding \lstinline!inner! element declaration exists or can be created in a unique way:
 \begin{itemize}
 \item
-  If there are two (or more) \lstinline!outer! declarations with the same name, both lacking matching \lstinline!inner! declarations, and the \lstinline!outer! declarations are not of the same class it is in error.
+  If there are two (or more) \lstinline!outer! declarations with the same name, both lacking matching \lstinline!inner! declarations, and the \lstinline!outer! declarations are not of the same class it is an error.
 \item
   If there is one (or more) \lstinline!outer! declarations of a partial class it is an error.
 \item