Update description-en.txt (#3884)

Update description to combine multiple sentences for conciseness and to enhance explanation and details of uBO's purpose.

Author: q1800

dist/description/description-en.txt

@@ -1,6 +1,4 @@
-Though uBlock Origin (uBO) blocks all ads by default, it is not an "ad blocker." It is a wide-spectrum content blocker with CPU and memory efficiency as primary features.
-
-Out of the box, uBO blocks ads, trackers, coin miners, popups, etc. through the following lists of filters, enabled by default:
+uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc., using the following list of filters, enabled by default:
 
 - EasyList (ads)
 - EasyPrivacy (tracking)