Small error in docs for pattern matching module

[Paul Morris]

Hi, I found a small error in the docs for the pattern matching module:

https://www.gnu.org/software/guile/manual/html_node/Pattern-Matching.html

There should be no "exp" in these argument lists:

Scheme Syntax: match-lambda exp clause1 clause2 …
Scheme Syntax: match-lambda* exp clause1 clause2 …

-Paul