gc: update usage string in doc.go

R=rsc, r2, r
CC=golang-dev
https://golang.org/cl/2550041

diff --git a/src/cmd/gc/doc.go b/src/cmd/gc/doc.go
index 7798f9bf85fda75079d704d7dcf7aa4346c0d2c7..45db1acf1b08629386267351dd7e11b74ac07e67 100644 (file)
--- a/src/cmd/gc/doc.go
+++ b/src/cmd/gc/doc.go
@@ -25,7 +25,10 @@ other packages. It is therefore not necessary when compiling client C of
 package P to read the files of P's dependencies, only the compiled output
 of P.
 
-Usage: 6g [flags] *.go  (or 8g or 5g)
+Usage:
+       6g [flags] file...
+The specified files must be Go source files and all part of the same package.
+Substitute 6g with 8g or 5g where appropriate.
 
 Flags:
        -o file