Merge ~chad.smith/cloud-init:cleanup/zstack-docs into cloud-init:master

[Chad Smith]

docs: fix zstack documentation lints

Resolve the following lints raised by 'make doc':
- doc/rtd/topics/datasources/zstack.rst:5: D001 Line too long
- doc/rtd/topics/datasources/zstack.rst:10: D001 Line too long

[Server Team CI bot (server-team-bot)]

PASSED: Continuous integration, rev:7adb51a4efb76b77731ae740797be2303a41caaa
https://jenkins.ubuntu.com/server/job/cloud-init-ci/1179/
Executed test runs:
    SUCCESS: Checkout
    SUCCESS: Unit & Style Tests
    SUCCESS: Ubuntu LTS: Build
    SUCCESS: Ubuntu LTS: Integration
    IN_PROGRESS: Declarative: Post Actions

Click here to trigger a rebuild:
https://jenkins.ubuntu.com/server/job/cloud-init-ci/1179//rebuild

review: Approve (continuous-integration)

[Dan Watkins (oddbloke)]

Does what it says on the tin.

review: Approve

diff --git a/doc/rtd/topics/datasources/zstack.rst b/doc/rtd/topics/datasources/zstack.rst
index 36e60ff..93a2791 100644
--- a/doc/rtd/topics/datasources/zstack.rst
+++ b/doc/rtd/topics/datasources/zstack.rst
@@ -2,14 +2,15 @@
 
 ZStack
 ======
-ZStack platform provides a AWS Ec2 metadata service, but with different datasource identity.
+ZStack platform provides a AWS Ec2 metadata service, but with different
+datasource identity.
 More information about ZStack can be found at `ZStack <https://www.zstack.io>`__.
 
 Discovery
 ---------
-To determine whether a vm running on ZStack platform, cloud-init checks DMI information
-by 'dmidecode -s chassis-asset-tag', if the output ends with '.zstack.io', it's running
-on ZStack platform:
+To determine whether a vm running on ZStack platform, cloud-init checks DMI
+information by 'dmidecode -s chassis-asset-tag', if the output ends with
+'.zstack.io', it's running on ZStack platform:
 
 
 Metadata