make draw() link title bold

Author: babaissarkar

content/tutorials/text/pvector/index.mdx

@@ -119,7 +119,7 @@ Here are some vectors and possible translations:
 
 </FixedImage>
 
-You've probably done this before when programming motion. For every frame of animation (i.e. single cycle through Processing's [draw()](http://processing.org/reference/draw_.html) loop), you instruct each object on the screen to move a certain number of pixels horizontally and a certain number of pixels (vertically).
+You've probably done this before when programming motion. For every frame of animation (i.e. single cycle through Processing's [**draw()**](http://processing.org/reference/draw_.html) loop), you instruct each object on the screen to move a certain number of pixels horizontally and a certain number of pixels (vertically).
 
 For a Processing programmer, we can now understand a vector as the instructions for moving a shape from point A to point B, an object's &ldquo;pixel velocity&rdquo; so to speak.