Update cheatsheets

xev

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xev
+
+> Print contents of X events.
+> More information: <https://gitlab.freedesktop.org/xorg/app/xev>.
+
+- Monitor all occurring X events:
+
+`xev`
+
+- Monitor all X events of the root window instead of creating a new one:
+
+`xev -root`
+
+- Monitor all X events of a particular window:
+
+`xev -id {{window_id}}`
+
+- Monitor X events from a given category (can be specified multiple times):
+
+`xev -event {{event_category}}`