Update cheatsheets

mysqlcheck

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mysqlcheck
+
+> Check and repair MySQL tables.
+> More information: <https://dev.mysql.com/doc/refman/8.0/en/mysqlcheck.html>.
+
+- Check a table:
+
+`mysqlcheck --check {{table}}`
+
+- Check a table and provide credentials to access it:
+
+`mysqlcheck --check {{table}} --user {{username}} --password {{password}}`
+
+- Repair a table:
+
+`mysqlcheck --repair {{table}}`
+
+- Optimize a table:
+
+`mysqlcheck --optimize {{table}}`