static analysis doc updated

docs/static_analysis.md

-Analysis
-========
+Solidity Static Analysis
+========================
 
-This section gives information about the last compilation. By default, a
-new analysis is run at each compilation.
+Static code analysis is a process to debug the code by examining it and without actually executing the code. 
 
-The analysis tab gives detailed information about the contract code. It
-can help you avoid code mistakes and to enforce best practices.
+`Solidity Static Analysis` plugin performs static analysis on Solidity smart contracts once they are compiled. It helps to check security vulnerabilities and bad development practices. This plugin comes with `Solidity` environment of Remix IDE. It can also be activated individually from `Plugin Manager`.
+
+How to use
+------------
+
+If you select this plugin, you will see a number of modules listed along with checkboxes, one `Auto run` checkbox and a `Run` button.
 
 ![](images/a-static-analysis.png)
 
+By default, all modules are selected for analysis and a new analysis is performed at each compilation.
+
+One can select the modules under which contract should be analyzed and can run the analysis again for last compiled contract by clicking on `Run`.
+
+If you don't want to run analysis each time you compile a contract, just uncheck the checkbox near to `Auto run`.
+
+Analysis Modules
+-----------------
+
 Here is the list of analyzers:
 
 Security: