Update week2.do.txt

Author: mhjensen

doc/src/week2/week2.do.txt

@@ -12,7 +12,6 @@ o defined the state vector and the associated notation
 o introduced the inner product and showed how to calculate it in an orthonormal basis
 o introduced outer products and projection operators
 o introduced tensor products and showed how to construct state vectors for multiple qubits
-o introduced the spectral decomposition of operators
 !eblock
 
 !split