Update git submodules
* Update charm-placement from branch 'master' to 7b34a3124e8fd1cd01cf1f01ef19d36f27684c57 - Merge "Add docs key and point at Discourse" - Add docs key and point at Discourse Add the 'docs' key and point it at a Discourse topic previously populated with the charm's README contents. When the new charm revision is released to the Charmhub, this Discourse-based content will be displayed there. In the absense of the this new key, the Charmhub's default behaviour is to display the value of the charm's 'description' key. Change-Id: I8ce65b31e286ee9b081a1dc5b7f27bde8a2ba5d2
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