Improve the SDK Platform description (#697)

* Resolve conflicts

* Fix conflict

* Add Platform intro to SDK pages

* Improve sdk message

Author: SowaProgramuje

content/guides/tooling/sdks/index.md

@@ -53,7 +53,7 @@ Here's what you can expect from the new SDKs:
 - **Embedded Documentation**: All objects and parameters are documented directly in the source code of the SDK so all the necessary information is stored in one place.
 - **Enhanced Convenience Methods**: The newly introduced convenience methods cover various aspects such as authentication, chunk uploads, exponential back-offs, automatic retries, type checkers which help to ensure that you’re using variables correctly, and much more.
 
-Find the Box Platform SDK in programming language of your choice and get started:
+Find the Box Platform SDK in a programming language of your choice and get started:
 
 | Platform                            | Maintained? | API Parity |
 | ----------------------------------- | ----------- | ---------- |

content/pages/sdks-and-tools/index.md

@@ -58,7 +58,7 @@ Here's what you can expect from the new SDKs:
 - **Embedded Documentation**: All objects and parameters are documented directly in the source code of the SDK so all the necessary information is stored in one place.
 - **Enhanced Convenience Methods**: The newly introduced convenience methods cover various aspects such as authentication, chunk uploads, exponential back-offs, automatic retries, type checkers which help to ensure that you’re using variables correctly, and much more.
 
-Find the Box Platform SDK in programming language of your choice and get started:
+Find the Box Platform SDK in a programming language of your choice and get started:
 
 | Platform                            | Maintained? | API Parity |
 | ----------------------------------- | ----------- | ---------- |