corrected abstract of appnote

manual/APPNOTE_012_Verilog_to_BTOR.tex

@@ -60,11 +60,11 @@ Verilog-2005 is a powerful Hardware Description Language (HDL) that
 can be used to easily create complex designs from small HDL code.
 BTOR~\cite{btor} is a bit-precise word-level format for model
 checking.  It is simple format and easy to parse.  It allows to model
-the model checking problem over extensional theory of bit-vectors with
+the model checking problem over theory of bit-vectors with
 one-dimensional arrays, thus enabling to model verilog designs with
-registers and memories.
-Yosys \cite{yosys} is an Open-Source Verilog synthesis tool that can
-be used to convert Verilog designs with simple assertions to BTOR format.
+registers and memories.  Yosys \cite{yosys} is an Open-Source Verilog
+synthesis tool that can be used to convert Verilog designs with simple
+assertions to BTOR format.
 
 \end{abstract}