Update cheatsheets

tldr/freebsd/procstat

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+---
+syntax: markdown
+tags: [tldr, freebsd]
+source: https://github.com/tldr-pages/tldr.git
+---
+# procstat
+
+> Display detailed information about processes in FreeBSD.
+> More information: <https://man.freebsd.org/cgi/man.cgi?query=procstat>.
+
+- Display file descriptors of a specific process:
+
+`procstat fds {{pid}}`
+
+- Show virtual memory mappings of a process:
+
+`procstat vm {{pid}}`
+
+- Display process arguments:
+
+`procstat arguments {{pid}}`
+
+- Show resource limits of a process:
+
+`procstat rlimit {{pid}}`