Update cheatsheets

osx/notifyd

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+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# notifyd
+
+> Notification server.
+> It should not be invoked manually.
+> More information: <https://keith.github.io/xcode-man-pages/notifyd.8.html>.
+
+- Start the daemon:
+
+`notifyd`
+
+- Log debug messages to the default log file (`/var/log/notifyd.log`):
+
+`notifyd -d`
+
+- Log debug messages to an alternate log file:
+
+`notifyd -d -log_file {{path/to/log_file}}`