Fix format of generate docs (#3716)

Author: emcfarlane

private/buf/cmd/buf/command/generate/generate.go

@@ -96,13 +96,13 @@ func NewCommand(
         # Whether to generate code for the well-known types.
         # Optional.
         include_wkt: false
-	# Include only these types for this plugin.
+        # Include only these types for this plugin.
         # Optional.
-	types:
-	  - "foo.v1.User"
-	# Exclude these types for this plugin.
+        types:
+          - "foo.v1.User"
+        # Exclude these types for this plugin.
         # Optional.
-	exclude_types:
+        exclude_types:
           - "buf.validate.oneof"
           - "buf.validate.message"
           - "buf.validate.field""
@@ -259,10 +259,10 @@ func NewCommand(
         types:
           - "foo.v1.User"
           - "foo.v1.UserService"
-	# Exclude these types.
-	# Optional.
-	exclude_types:
-	  - "buf.validate"
+        # Exclude these types.
+        # Optional.
+        exclude_types:
+          - "buf.validate"
         # Only generate code for files in these paths.
         # If empty, include all paths.
         paths: