Fix links and typos in markdown files

CONTRIBUTING.md

@@ -69,7 +69,7 @@ Trio is a collaborative project, and contributions of all kinds are welcome. Whe
 ### Getting started
 
 1. Fork the [Trio repository](https://github.com/nightscout/Trio) on GitHub.
-1. Create a separate branch for each feature, or fix with an [appropriate name](#branch-names).
+1. Create a separate branch for each feature or fix with an [appropriate name](#branch-names).
 1. Branch from the most recent appropriate development branch (typically `dev`).
 1. Commit your changes to your fork.
 1. When ready, open a pull request against the upstream repository (`nightscout/Trio`).

README.md

@@ -38,7 +38,7 @@ You can either use the Build Script or you can run each command manually.
 
 ### Build Script:
 
-If you copy, paste, and run the following script in Terminal, it will guide you through downloading and installing Trio. More information about the script can be found [here](https://triodocs.org/install/build/mac/overview/).
+If you copy, paste, and run the following script in Terminal, it will guide you through downloading and installing Trio. More information about the script can be found [here](https://triodocs.org/install/build/mac/build/).
 
 ```
 /bin/bash -c "$(curl -fsSL \
@@ -80,7 +80,7 @@ xed .
 
 Instructions in **greater detail**:
 
-- http://triodocs.org/install/build/browser/browser-build-overview/
+- https://triodocs.org/install/build/browser/browser-build-overview/
 
 ---