Update cheatsheets

ab

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ab
+
+> Apache HTTP server benchmarking tool.
+> More information: <https://httpd.apache.org/docs/current/programs/ab.html>.
+
+- Execute 100 HTTP GET requests to a given URL:
+
+`ab -n 100 {{url}}`
+
+- Execute 100 HTTP GET requests, in concurrent batches of 10, to a URL:
+
+`ab -n 100 -c 10 {{url}}`
+
+- Execute 100 HTTP POST requests to a URL, using a JSON payload from a file:
+
+`ab -n 100 -T {{application/json}} -p {{path/to/file.json}} {{url}}`
+
+- Use HTTP [k]eep-Alive, i.e. perform multiple requests within one HTTP session:
+
+`ab -k {{url}}`
+
+- Set the maximum number of seconds ([t]imeout) to spend for benchmarking (30 by default):
+
+`ab -t {{60}} {{url}}`
+
+- Write the results to a CSV file:
+
+`ab -e {{path/to/file.csv}}`