Update cheatsheets

tldr/knotc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# knotc
+
+> Control knot DNS server.
+> More information: <https://www.knot-dns.cz/docs/latest/html/man_knotc.html>.
+
+- Start editing a zone:
+
+`knotc zone-begin {{zone}}`
+
+- Set an A record with TTL of 3600:
+
+`knotc zone-set {{zone}} {{subdomain}} 3600 A {{ip_address}}`
+
+- Finish editing the zone:
+
+`knotc zone-commit {{zone}}`
+
+- Get the current zone data:
+
+`knotc zone-read {{zone}}`
+
+- Get the current server configuration:
+
+`knotc conf-read server`