Add variable arguments to init help text

internal/command/init.go

@@ -1139,6 +1139,15 @@ Options:
 
   -test-directory=path    Set the Terraform test directory, defaults to "tests".
 
+  -var 'foo=bar'          Set a value for one of the input variables in the root
+                          module of the configuration. Use this option more than
+                          once to set more than one variable.
+
+  -var-file=filename      Load variable values from the given file, in addition
+                          to the default files terraform.tfvars and *.auto.tfvars.
+                          Use this option more than once to include more than one
+                          variables file.
+
   -enable-pluggable-state-storage-experiment [EXPERIMENTAL]
                           A flag to enable an alternative init command that allows use of
                           pluggable state storage. Only usable with experiments enabled.