Update cheatsheets

apropos

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apropos
+
+> Search the manual pages for names and descriptions.
+> More information: <https://manned.org/apropos>.
+
+- Search for a keyword using a regular expression:
+
+`apropos {{regular_expression}}`
+
+- Search without restricting the output to the terminal width ([l]ong output):
+
+`apropos -l {{regular_expression}}`
+
+- Search for pages that match [a]ll the expressions given:
+
+`apropos {{regular_expression_1}} -a {{regular_expression_2}} -a {{regular_expression_3}}`