Fix Typo in upgrades.html

I am fairly certain "What is does" should be "What it does"
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serenewaffles
2021-09-06 17:18:23 -04:00
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<li><a href="https://ebay.us/xfwSXM" target="_blank">eBay</a></li>
<li><a href="https://www.creality3dofficial.com/products/cr-10-v2-bl-touch-auto-bed-leveling-sensor?sca_ref=16987.xbmLCEL46n" target="_blank">Creality official webstore</a></li>
</ul>
<h5>What is does:</h5>
<h5>What it does:</h5>
<p>A BLtouch is an auto bed levelling probe. When attached to the print head, it can be moved in a grid pattern around the bed, measuring the height at each probing point and then creating a contour map of the bed. When a new print begins, this contour map can be applied to the first layer, moving the nozzle up and down as necessary to compensate for a warped or uneven bed.</p>
<h5>Advantages:</h5>
<p>A BLtouch is very convenient in that it removes the need to manually level your 3D printer bed. In situations where the bed is warped, manual levelling will never give a perfect first layer and an ABL probe is the only means to achieve this. Compared to other contactless ABL probes, a BLtouch physically touches the bed with its pin when probing. Therefore it doesn't care what the bed surface is or it's current temperature. A BLtouch allows the print surface to be swapped or changed without recalibration.</p>