Spring Document usage of SpEL's power operator in the reference manual

The SpEL documentation for Mathematical Operators currently mentions the power operator (^) but does not provide any examples.

Comment From: sbrannen

Addressed in 24d6565cad534037ad16cb02697147c4944b02b3 and 7025b7aac25afa4be0f086c1ffc6787014183f25.