Update cheatsheets

linux/xrdb

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xrdb
+
+> X window server's resource database utility for Unix-like systems.
+> More information: <https://www.x.org/releases/X11R7.7/doc/man/man1/xrdb.1.xhtml>.
+
+- Start `xrdb` in interactive mode:
+
+`xrdb`
+
+- Load values (e.g. style rules) from a resource file:
+
+`xrdb -load {{~/.Xresources}}`
+
+- Query the resource database and print currently set values:
+
+`xrdb -query`