Update cheatsheets

tldr/linux/lxc-ls

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lxc-ls
+
+> List Linux containers.
+> More information: <https://linuxcontainers.org/lxc/manpages/man1/lxc-ls.1.html>.
+
+- List active containers (including frozen and running):
+
+`lxc-ls --active`
+
+- List only frozen containers:
+
+`lxc-ls --frozen`
+
+- List only stopped containers:
+
+`lxc-ls --stopped`
+
+- List containers in a fancy, column-based output:
+
+`lxc-ls --fancy`