Merge pull request cockroachdb#3225 from a-robinson/export

 Fix documentation of GCS AUTH for import/export docs

Author: a-robinson

_includes/external-urls-v2.0.md

@@ -13,7 +13,7 @@
 
 #### Considerations
 
-- <sup>1</sup> If the `AUTH` parameter is empty or `default`, all GCS connections use Google's [default authentication strategy](https://cloud.google.com/docs/authentication/production#providing_credentials_to_your_application). The `cloudstorage.gs.default.key` [cluster setting](cluster-settings.html) can be set to the contents of a service account file which will be used during authentication. The `AUTH` parameter can be set to `implicit` to ignore `cloudstorage.gs.default.key` and always use the default strategy.
+- <sup>1</sup> If the `AUTH` parameter is `implicit`, all GCS connections use Google's [default authentication strategy](https://cloud.google.com/docs/authentication/production#providing_credentials_to_your_application). If the `AUTH` parameter is `default`, the `cloudstorage.gs.default.key` [cluster setting](cluster-settings.html) must be set to the contents of a [service account file](https://cloud.google.com/docs/authentication/production#obtaining_and_providing_service_account_credentials_manually) which will be used during authentication. If the `AUTH` parameter is not specified, the `cloudstorage.gs.default.key` setting will be used if it is non-empty, otherwise the `implicit` behavior is used.
 
 - <sup>2</sup> You can easily create your own HTTP server with [Caddy or nginx](create-a-file-server.html). A custom root CA can be appended to the system's default CAs by setting the `cloudstorage.http.custom_ca` [cluster setting](cluster-settings.html), which will be used when verifying certificates from HTTPS URLs.
 

v2.1/export.md

@@ -80,7 +80,7 @@ If not using comma as your column delimiter, you can specify another Unicode cha
 
 #### `nullas`
 
-Convert SQL *NULL* values to they match the specified string.
+Convert SQL *NULL* values so they match the specified string.
 
 <table>
 	<tbody>
@@ -94,7 +94,7 @@ Convert SQL *NULL* values to they match the specified string.
 		</tr>
 		<tr>
 			<td><strong>Value</strong></td>
-			<td>The string that should be converted to <em>NULL</em></td>
+			<td>The string that should be used to represent <em>NULL</em> values</td>
 		</tr>
 		<tr>
 			<td><strong>Example</strong></td>