Remove duplicate "is"

Author: jessla

docs/sourcemaps.rst

@@ -5,8 +5,7 @@ Source Maps
 
 Sentry supports un-minifying JavaScript via `Source Maps
 <http://blog.sentry.io/2015/10/29/debuggable-javascript-with-source-maps.html>`_. This lets you
-view source code context obtained from stack traces in their original untransformed form, which is
-is particularly useful for debugging minified code (e.g. UglifyJS), or transpiled code from a higher-level
+view source code context obtained from stack traces in their original untransformed form, which is particularly useful for debugging minified code (e.g. UglifyJS), or transpiled code from a higher-level
 language (e.g. TypeScript, ES6).
 
 Generating a Source Map