all: add some godoc synopsis comments

cmd/bootnode/main.go

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
-// Command bootnode runs a bootstrap node for the Discovery Protocol.
+// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
 package main
 
 import (

cmd/disasm/main.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
+// disasm is a pretty-printer for EVM bytecode.
 package main
 
 import (

cmd/ethtest/main.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
+// ethtest executes Ethereum JSON tests.
 package main
 
 import (

cmd/evm/main.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
+// evm executes EVM code snippets.
 package main
 
 import (

cmd/geth/main.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
+// geth is the official command-line client for Ethereum.
 package main
 
 import (

cmd/utils/cmd.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
 
+// Package utils contains internal helper functions for go-ethereum commands.
 package utils
 
 import (