corrected Grammatical errors (#15570)

README.md

@@ -83,7 +83,7 @@ Join thousands of members worldwide 24/7 in our [community server](https://open.
 
 [![Rocket.Chat](https://open.rocket.chat/api/v1/shield.svg?type=channel&name=Rocket.Chat&channel=dev)](https://open.rocket.chat/channel/dev) for developers needing help from the community to developing new features.
 
-You can also join the conversation at [Twitter](https://twitter.com/RocketChat) and [Facebook](https://www.facebook.com/RocketChatApp).
+You can also join the conversation on [Twitter](https://twitter.com/RocketChat) and [Facebook](https://www.facebook.com/RocketChatApp).
 
 # Desktop Apps
 Download the Native Cross-Platform Desktop Application at [Rocket.Chat.Electron](https://github.com/RocketChat/Rocket.Chat.Electron/releases)
@@ -138,7 +138,7 @@ The easiest way to install a ready-to-run Rocket.Chat server on a Linux machine,
 [![DP deploy](https://raw.githubusercontent.com/DFabric/DPlatform-ShellCore/images/logo.png)](https://dfabric.github.io/DPlatform-ShellCore)
 
 ## IndieHosters
-Get your Rocket.Chat instance hosted in a "as a Service" style. You register and we manage it for you! (updates, backup...).
+Get your Rocket.Chat instance hosted in an "as a Service" style. You register and we manage it for you! (updates, backup...).
 
 [![Rocket.Chat on IndieHosters](https://indie.host/signup.png)](https://indiehosters.net/shop/product/rocket-chat-21)
 
@@ -236,7 +236,7 @@ Run Rocket.Chat on your easy to use personal device.
 
 # About Rocket.Chat
 
-Rocket.Chat is a Web Chat Server, developed in JavaScript, using the [Meteor](https://www.meteor.com/install) fullstack framework.
+Rocket.Chat is a Web Chat Server, developed in JavaScript, using the [Meteor](https://www.meteor.com/install) full stack framework.
 
 It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms.
 
@@ -321,7 +321,7 @@ It is a great solution for communities and companies wanting to privately host t
 
 ## Roadmap
 
-To see an up to date view of what we have planned view our [milestones](https://github.com/RocketChat/Rocket.Chat/milestones).
+To see an up to date view of what we have planned, view our [milestones](https://github.com/RocketChat/Rocket.Chat/milestones).
 
 
 ## How it all started
@@ -352,7 +352,7 @@ Please use the [Stack Overflow TAG](http://stackoverflow.com/questions/tagged/ro
 #### Hubot
 
 The docker image is ready.
-Everyone can start hacking the adapter code, or launch his/her own bot within a few minutes now.
+Everyone can start hacking the adapter code or launch his/her own bot within a few minutes now.
 Please head over to the [Hubot Integration Project](https://github.com/RocketChat/hubot-rocketchat) for more information.
 
 
@@ -393,7 +393,7 @@ meteor npm install
 meteor npm start
 ```
 
-In order to debug the server part use [meteor debugging](https://docs.meteor.com/commandline.html#meteordebug). You should use Chrome for best debugging experience:
+To debug the server part, use [meteor debugging](https://docs.meteor.com/commandline.html#meteordebug). You should use Chrome for best debugging experience:
 
 ```sh
 meteor debug
@@ -416,7 +416,7 @@ If you want to help, send an email to support at rocket.chat to be invited to th
 
 ## How to Contribute
 
-Already a JavaScript developer? Familiar with Meteor? [Pick an issue](https://github.com/RocketChat/Rocket.Chat/labels/contrib%3A%20easy), push a PR and instantly become a member of Rocket.Chat's international contributors community. For more information, check out our [Contributing Guide](.github/CONTRIBUTING.md) and our [Official Documentation for Contributors](https://rocket.chat/docs/contributing/).
+Already a JavaScript developer? Familiar with Meteor? [Pick an issue](https://github.com/RocketChat/Rocket.Chat/labels/contrib%3A%20easy), push a PR and instantly become a member of Rocket.Chat's international contributors' community. For more information, check out our [Contributing Guide](.github/CONTRIBUTING.md) and our [Official Documentation for Contributors](https://rocket.chat/docs/contributing/).
 
 A lot of work has already gone into Rocket.Chat, but we have much bigger plans for it!
 
@@ -434,7 +434,7 @@ Thanks to our core team
 [Marcelo Schmidt](https://github.com/marceloschmidt),
 [Rodrigo Nascimento](https://github.com/rodrigok),
 [Sing Li](https://github.com/Sing-Li),
-and to hundreds of awesome [contributors](https://github.com/RocketChat/Rocket.Chat/graphs/contributors).
+and hundreds of awesome [contributors](https://github.com/RocketChat/Rocket.Chat/graphs/contributors).
 
 ![JoyPixels](https://i.imgur.com/OrhYvLe.png)