docs(style-guide): Fix Single responsibility principle abbreviation (#3318)

Author: cmckni3

public/docs/ts/latest/guide/style-guide.jade

@@ -64,7 +64,7 @@ a(id='toc')
   ## Single responsibility
 
   Apply the 
-  <a href="https://wikipedia.org/wiki/Single_responsibility_principle" target="_blank"><i>Single Responsibility Principle</i> (SPR)</a>
+  <a href="https://wikipedia.org/wiki/Single_responsibility_principle" target="_blank"><i>Single Responsibility Principle</i> (SRP)</a>
   to all components, services, and other symbols. 
   This helps make the app cleaner, easier to read and maintain, and more testable.