docs: typos fixed (#785)

Fix typos in README.md and CONTRIBUTING.md

Author: RodgerLeblanc

CONTRIBUTING.md

@@ -141,7 +141,7 @@ Generally, we follow the style guidelines as suggested by the official language.
 
 4. Commit your changes in logical chunks. Please adhere to these [git commit
    message guidelines](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
-   or your code is unlikely be merged into the main project. Use Git's
+   or your code is unlikely to be merged into the main project. Use Git's
    [interactive rebase](https://help.github.com/articles/interactive-rebase)
    feature to tidy up your commits before making them public.
 

README.md

@@ -65,7 +65,7 @@ Grab your API Key from the [Twilio SendGrid UI](https://app.sendgrid.com/setting
 <a name="setup"></a>
 ## Setup Environment Variables to Manage Your API Key
 
-Manage your [Twilio SendGrid API Keys](https://app.sendgrid.com/settings/api_keys) by storing them in Environment Variables or in [Web.config](https://docs.microsoft.com/en-us/aspnet/identity/overview/features-api/best-practices-for-deploying-passwords-and-other-sensitive-data-to-aspnet-and-azure). It is a good practice to keep your data and configuration settings separate. This way to you can change your Twilio SendGrid API key without changing your code. Also, we strongly advise against storing sensitive data directly in your code.
+Manage your [Twilio SendGrid API Keys](https://app.sendgrid.com/settings/api_keys) by storing them in Environment Variables or in [Web.config](https://docs.microsoft.com/en-us/aspnet/identity/overview/features-api/best-practices-for-deploying-passwords-and-other-sensitive-data-to-aspnet-and-azure). It is a good practice to keep your data and configuration settings separate. This way you can change your Twilio SendGrid API key without changing your code. Also, we strongly advise against storing sensitive data directly in your code.
 
 Setup Environment Variables using the UI:
 
@@ -102,7 +102,7 @@ dotnet add package SendGrid
 dotnet add package SendGrid.Extensions.DependencyInjection
 ```
 
-Once you have the Twilio SendGrid library installed, you can include calls to them in your code.
+Once you have the Twilio SendGrid library installed, you can include calls to it in your code.
 For sample implementations, see the [.NET Core Example](https://github.com/sendgrid/sendgrid-csharp/tree/master/ExampleCoreProject) and the [.NET 4.5.2 Example](https://github.com/sendgrid/sendgrid-csharp/tree/master/ExampleNet45Project) folders.
 
 ## Dependencies
@@ -139,7 +139,7 @@ class Program
 }
 ```
 
-After executing the above code, `response.StatusCode` should be `202` and you should have an email in the inbox of the to recipient. You can check the status of your email [in the UI](https://app.sendgrid.com/email_activity?). Alternatively, we can post events to a URL of your choice using our [Event Webhook](https://sendgrid.com/docs/API_Reference/Webhooks/event.html). This gives you data about the events that occur as Twilio SendGrid processes your email.
+After executing the above code, `response.StatusCode` should be `202` and you should have an email in the inbox of the `to` recipient. You can check the status of your email [in the UI](https://app.sendgrid.com/email_activity?). Alternatively, we can post events to a URL of your choice using our [Event Webhook](https://sendgrid.com/docs/API_Reference/Webhooks/event.html). This gives you data about the events that occur as Twilio SendGrid processes your email.
 
 For more advanced cases, you can build the SendGridMessage object yourself with these minimum required settings: