tweak documentation of commands
so that first sentence is better for cmd page.
live at http://r45:3456/cmd/
R=gri, r
http://go/go-review/1024034
diff --git a/src/cmd/goyacc/doc.go b/src/cmd/goyacc/doc.go
index ea5813e..a3cf075 100644
--- a/src/cmd/goyacc/doc.go
+++ b/src/cmd/goyacc/doc.go
@@ -4,8 +4,8 @@
/*
-The program goyacc is a version of yacc written in Go and generating
-as output a parser also in Go.
+Goyacc is a version of yacc for Go.
+It is written in Go and generates parsers written in Go.
It is largely transliterated from the Inferno version written in Limbo
which in turn was largely transliterated from the Plan 9 version
