reformat log helptext (80 char width)

Author: djdv

core/commands/log.go

@@ -24,8 +24,10 @@ output of a running daemon.
 
 There are also two environmental variables that direct the logging 
 system (not just for the daemon logs, but all commands):
-    IPFS_LOGGING - sets the level of verbosity of the logging. One of: debug, info, warn, error, dpanic, panic, fatal
-    IPFS_LOGGING_FMT - sets formatting of the log output. One of: color, nocolor
+    IPFS_LOGGING - sets the level of verbosity of the logging.
+        One of: debug, info, warn, error, dpanic, panic, fatal
+    IPFS_LOGGING_FMT - sets formatting of the log output.
+        One of: color, nocolor
 `,
 	},