all.bash: update usage

The all.bash usage information is updated to include descriptions
for go mod tidy and go tests.

Change-Id: I1c4fdeaa72c41a4e41d48020d0b46ba037462aec
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/359411
Trust: Julie Qiu <julie@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/all.bash b/all.bash
index 6febfee..33a7361 100755
--- a/all.bash
+++ b/all.bash
@@ -139,10 +139,12 @@
 Available subcommands:
   (empty)        - run all standard checks and tests:
      * headers: check source files for the license disclaimer
-     * misspell: run misspell on source files
-     * staticcheck: run staticcheck on source files
-     * unparam: run unparam on source files
      * vet: run go vet on source files
+     * staticcheck: run staticcheck on source files
+     * misspell: run misspell on source files
+     * unparam: run unparam on source files
+     * tidy: run go mod tidy
+     * tests: run all Go tests
   help           - display this help message
 EOUSAGE
 }