Fixing a typo in doc's EVM dialect in Yul's doc.

It's the tiniest typo but it's visible on the website.

Author: wesbz

docs/yul.rst

@@ -768,7 +768,7 @@ the ``dup`` and ``swap`` instructions as well as ``jump`` instructions, labels a
 +-------------------------+-----+---+-----------------------------------------------------------------+
 | Instruction             |     |   | Explanation                                                     |
 +=========================+=====+===+=================================================================+
-| stop()                  + `-` | F | stop execution, identical to return(0, 0)                       |
+| stop()                  | `-` | F | stop execution, identical to return(0, 0)                       |
 +-------------------------+-----+---+-----------------------------------------------------------------+
 | add(x, y)               |     | F | x + y                                                           |
 +-------------------------+-----+---+-----------------------------------------------------------------+