Add link to Bitbucket Discovery, fix capitalization

Signed-off-by: Tim Hansen <timbonicus@gmail.com>

docs/integrations/bitbucket/locations.md

@@ -7,7 +7,7 @@ description:
 ---
 
 The Bitbucket integration supports loading catalog entities from bitbucket.org
-or a self-hosted BitBucket. Entities can be added to
+or a self-hosted Bitbucket. Entities can be added to
 [static catalog configuration](../../features/software-catalog/configuration.md),
 or registered with the
 [catalog-import](https://github.com/backstage/backstage/tree/master/plugins/catalog-import)
@@ -17,7 +17,6 @@ plugin.
 integrations:
   bitbucket:
     - host: bitbucket.org
-      username: ${BITBUCKET_USERNAME}
       token: ${BITBUCKET_TOKEN}
 ```
 

docs/integrations/index.md

@@ -8,7 +8,7 @@ description:
 ---
 
 Integrations allow Backstage to read or publish data using external providers
-such as GitHub, GitLab, BitBucket, LDAP, or cloud providers.
+such as GitHub, GitLab, Bitbucket, LDAP, or cloud providers.
 
 ## Configuration
 
@@ -17,7 +17,7 @@ integrations are used by many Backstage core features and other plugins.
 
 Each key under `integrations` is a separate configuration for a single external
 provider. Providers each have different configuration; here's an example of
-configuration to use both GitHub and BitBucket:
+configuration to use both GitHub and Bitbucket:
 
 ```yaml
 integrations: