feat: gen markdown docs for command

docs/cmd/httpboomer_boom.md

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+## httpboomer boom
+
+run load test with boomer
+
+### Synopsis
+
+run yaml/json testcase files for load test
+
+```
+httpboomer boom [flags]
+```
+
+### Examples
+
+```
+  $ httpboomer boom demo.json	# run specified json testcase file
+  $ httpboomer boom demo.yaml	# run specified yaml testcase file
+  $ httpboomer boom examples/	# run testcases in specified folder
+```
+
+### Options
+
+```
+      --cpu-profile string              Enable CPU profiling.
+      --cpu-profile-duration duration   CPU profile duration. (default 30s)
+  -h, --help                            help for boom
+      --master-host string              Host or IP address of locust master for distributed load testing. (default "127.0.0.1")
+      --master-port int                 The port to connect to that is used by the locust master for distributed load testing. (default 5557)
+      --max-rps int                     Max RPS that boomer can generate, disabled by default.
+      --mem-profile string              Enable memory profiling.
+      --mem-profile-duration duration   Memory profile duration. (default 30s)
+      --request-increase-rate string    Request increase rate, disabled by default. (default "-1")
+      --run-tasks string                Run tasks without connecting to the master, multiply tasks is separated by comma. Usually, it's for debug purpose.
+```
+
+### SEE ALSO
+
+* [httpboomer](httpboomer.md)	 - One-stop solution for HTTP(S) testing.
+
+###### Auto generated by spf13/cobra on 11-Oct-2021