Edit README.md

Edit file, mostly for active voice.

Author: Amanda Butler

README.md

@@ -1,12 +1,15 @@
-# Mbed OS Docs-Only Examples
-This repository contains example applications snippets that currently only exist in the Mbed OS docs.
+# Mbed OS docs-only examples
+
+This repository contains example applications snippets that only exist in the Mbed OS docs.
 
 ## Contributions
 
-Contribute the the example folder need to following bellow requirements
-- Every individual example snippet need to contain a compile-able `main.cpp` and placed into one folder with all required files.
-- The path to the folder has to be in the 2 level folder structure `Repo_ROOT/<Level1>/<Level2>/main.cpp` we recommend to following our conventions: `Repo_ROOT/Category_Topic/Module_Example`
-- A `README.md` file in the snippet folder is optional, the main instruction and explanatory documents should be contributed to [mbed-os-docs](https://github.com/ARMmbed/mbed-os-5-docs). 
-- the `Level2` folder name, e.g. `<Module_Example>`, need to be unique to any other `Level2` folder in this repository and contains no more than 34 characters.
-- The CI on this repository will check on the above criteria and also make sure the snippets able to be built 
+Contributions to the example folder need to meet these requirements:
+
+- Every individual example snippet needs to contain a `main.cpp` that compiles. You must place this file into a folder with all other required files.
+- The path to the folder has to be in the second-level folder structure `Repo_ROOT/<Level1>/<Level2>/main.cpp`. We recommend you follow our conventions: `Repo_ROOT/Category_Topic/Module_Example`.
+- A `README.md` file in the snippet folder is optional. Contribute the main instructions and explanatory documents to the [mbed-os-5-docs](https://github.com/ARMmbed/mbed-os-5-docs) repository. 
+- The `Level2` folder name, for example `<Module_Example>`, needs to be unique compared to any other `Level2` folder in this repository. It can contain no more than 34 characters.
+
+The CI on this repository checks on the above criteria and also makes sure the snippets can build.