docs: fix authn-jwt table (#4765)

Fixes a table issue introduced in
#4711

---------

Co-authored-by: Edward Huang <edward.huang@apollographql.com>

docs/source/configuration/authn-jwt.mdx

@@ -144,9 +144,12 @@ The default value is `Bearer`.
 </td>
 </tr>
 
+<tr>
+<td style="min-width: 150px;">
+
 ##### `sources`
 
-<tr>
+</td>
 <td>
 
 This is an array of possible token sources, as it could be provided in different headers depending on the client, or it could be stored in a cookie. If the default token source defined by the above `header_name` and `header_value_prefix` does not find the token, then each of the alternative sources is tried until one matches.