Update cheatsheets

linux/rspamc

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rspamc
+
+> Command-line client for rspamd servers.
+> More information: <https://manned.org/rspamc>.
+
+- Train the bayesian filter to recognise an email as spam:
+
+`rspamc learn_spam {{path/to/email_file}}`
+
+- Train the bayesian filter to recognise an email as ham:
+
+`rspamc learn_ham {{path/to/email_file}}`
+
+- Generate a manual report on an email:
+
+`rspamc symbols {{path/to/email_file}}`
+
+- Show server statistics:
+
+`rspamc stat`