Fix some nits in markdown files (#550)

Signed-off-by: Dave Thaler <[email protected]>

.github/ISSUE_TEMPLATE/feature_request.md

@@ -8,7 +8,7 @@ assignees: ''
 ---
 
 **Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+A clear and concise description of what the problem is. Example: I'm always frustrated when [...]
 
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.

CONTRIBUTING.md

@@ -11,10 +11,10 @@ We recommend following these steps if you'd like to contribute to the repo.
 
 0. Check out the [Trello board](https://trello.com/b/hRFh7Sc1/orcasite-development) for an overview of features being worked on.
     - This [public roadmap](https://trello.com/b/wBg0qhss/orcasound-roadmap) has a higher level view.
-1. Fork the Orcasite repo
-2. Develop on a [feature branch](https://www.atlassian.com/git/tutorials/comparing-workflows/feature-branch-workflow)
+1. Fork the Orcasite repo.
+2. Develop on a [feature branch](https://www.atlassian.com/git/tutorials/comparing-workflows/feature-branch-workflow).
 3. Submit a PR (don't review your own)!
-  	- To maintain a consistent style, we recommend running [Prettier](https://github.com/prettier/prettier) on js, and `mix format` before submission
+    - To maintain a consistent style, we recommend running [Prettier](https://github.com/prettier/prettier) on js, and `mix format` before submission.
 4. Once a PR is merged, we can throw it up onto the dev server to see how things look!
 
 ### Questions?
@@ -51,6 +51,6 @@ If you're new to Elixir (or JS and React), that's no problem! Here are some reso
 - [Apollo GraphQL](https://www.apollographql.com/docs/react/) - Javascript library for GraphQL
 
 ### Example codebases
-Some of these are convenient for reference
+Some of these are convenient for reference:
 
-- [Evercam](https://github.com/evercam/evercam-server/) - Good example of supervision trees
+- [Evercam](https://github.com/evercam/evercam-server/) - Good example of supervision trees

README.md

@@ -147,7 +147,7 @@ Once everything finishes starting up, you'll be able to access the UI at [`http:
 
 ### UI
 
-The new version (v3) is currently under development, rapidly changing, and has no tests yet
+The new version (v3) is currently under development, rapidly changing, and has no tests yet.
 
 ## Deployment