Improve Readability of Issue Template (#1260)

* Modify grammar and spelling in ISSUE_TEMPLATE

* Modify sample code sentence

* correct Shapshot typo, and capitalization

Author: Mark Han

ISSUE_TEMPLATE.md

@@ -1,12 +1,12 @@
 ## Description
 
-Please describe the issue. It may be a bug description. So then please briefly descride steps which you were trying to perform and what happened instead.
-If there is the feature you want to see added to Appium Java client so please describe necessity of this feature and the way that it should work.
+Please describe the issue. If it is a bug, please briefly describe the steps to reproduce and the actual vs expected behavior.
+If there is a feature that you would like to see added to the Appium Java client, please describe the necessity of this feature and the way that it should work.
 
 ## Environment
 
-* java client build version or git revision if you use some shapshot:
-* Appium server version or git revision if you use some shapshot:
+* Java client build version or git revision if you use some snapshot:
+* Appium server version or git revision if you use some snapshot:
 * Desktop OS/version used to run Appium if necessary:
 * Node.js version (unless using Appium.app|exe) or Appium CLI or Appium.app|exe:
 * Mobile platform/version under test:
@@ -19,16 +19,16 @@ Please provide more details, if necessary.
 
 ## Code To Reproduce Issue [ Good To Have ]
 
-Please remember that, with sample code; it's easier to reproduce bug and much faster to fix it.
+Please remember: it's easier to reproduce and fix the bug with sample code.
 You can git clone https://github.com/appium/appium/tree/master/sample-code or https://github.com/appium/appium/tree/master/sample-code/apps and reproduce an issue using Java and sample apps.
 Also you can create a [gist](https://gist.github.com) with pasted java code sample or put it here using markdown. About markdown please read [Mastering markdown](https://guides.github.com/features/mastering-markdown/) and 
 [Writing on GitHub](https://help.github.com/categories/writing-on-github/)
 
-## Ecxeption stacktraces
+## Exception Stacktraces
 
-Please create a [gist](https://gist.github.com) with pasted stacktrace of exception thrown by java.
+Please create a [gist](https://gist.github.com) with the pasted stacktrace of the exception thrown by java.
 
-## Link to Appium logs
+## Link To Appium Logs
 
 Please create a [gist](https://gist.github.com) which is a paste of your _full_ Appium logs, and link them here. Do _not_ paste your full Appium logs here, as it will make this issue very long and hard to read! 
 If you are reporting a bug, _always_ include Appium logs as linked gists! It helps to define the problem correctly and clearly.