fix: typo in Chapter 1.1 (#40)

fix typo chisel-leb to chisel-lab in Chapter 1.1

chisel-book.tex

@@ -442,7 +442,7 @@ \section{Installing Chisel and FPGA Tools}
 
 More detailed setup instructions can be found in
 \myref{https://github.com/schoeberl/chisel-lab/blob/master/Setup.md}{Setup.md}
-from the \myref{https://github.com/schoeberl/chisel-lab}{chisel-leb}.
+from the \myref{https://github.com/schoeberl/chisel-lab}{chisel-lab}.
 The \myref{https://github.com/schoeberl/chisel-lab/tree/master/lab1}{first lab}
 explains how to open an existing Chisel project in IntelliJ.