doc: fix go_naming_convention default [skip ci] (#891)

For #890

README.rst

@@ -589,10 +589,9 @@ The following directives are recognized:
 | ``@io_bazel_rules_go//proto:gofast_grpc`` and |
 | ``@io_bazel_rules_go//proto:gogofaster_grpc``. |
 +---------------------------------------------------+----------------------------------------+
-| :direc:`# gazelle:go_naming_convention` | n/a  |
+| :direc:`# gazelle:go_naming_convention` | inferred automatically |
 +---------------------------------------------------+----------------------------------------+
-| Controls the names of generated Go targets. By default, library targets are named |
-| ``go_default_library`` and test targets ``go_default_test``. |
+| Controls the names of generated Go targets. |
 | |
 | Valid values are: |
 | |
@@ -606,6 +605,10 @@ The following directives are recognized:
 | ``foobin_test``. |
 | * ``import_alias``: Same as ``import``, but an ``alias`` target is generated named |
 | ``go_default_library`` to ensure backwards compatibility. |
+| |
+| If no naming convention is set, Gazelle attempts to infer the convention in |
+| use by reading the root build file and build files in immediate |
+| subdirectories. If no Go targets are found, Gazelle defaults to ``import``. |
 +---------------------------------------------------+----------------------------------------+
 | :direc:`# gazelle:go_naming_convention_external` | n/a |
 +---------------------------------------------------+----------------------------------------+