Removed extra "and" in a sentence (#1537)

Removed extra "and" in a sentence

Author: lex111

1-js/03-code-quality/01-debugging-chrome/article.md

@@ -137,7 +137,7 @@ There are buttons for it at the top of the right panel. Let's engage them.
 <span class="devtools" style="background-position:-62px -192px"></span> -- "Step over": run the next command, but *don't go into a function*, hotkey `key:F10`.
 : Similar to the previous the "Step" command, but behaves differently if the next statement is a function call. That is: not a built-in, like `alert`, but a function of our own.
 
-    The "Step" command goes into it and and pauses the execution at its first line, while "Step over" executes the nested function call invisibly, skipping the function internals.
+    The "Step" command goes into it and pauses the execution at its first line, while "Step over" executes the nested function call invisibly, skipping the function internals.
 
     The execution is then paused immediately after that function.