Remove mentions of --run-once and --disable-blocking-kernel from help

Text for --profile modified to be self-consistent, i.e., not to refer
to removed --run-once and --disable-blocking-kernel for explanantion
of what it does.

Author: oleksandr-pavlyk

docs/cli_help.md

@@ -108,25 +108,14 @@
   * Applies to the most recent `--benchmark`, or all benchmarks if specified
     before any `--benchmark` arguments.
 
-* `--run-once`
+* `--profile`
+  * Don't use the `blocking_kernel`.
   * Only run the benchmark once, skipping any warmup runs and batched
     measurements.
   * Intended for use with external profiling tools.
   * Applies to the most recent `--benchmark`, or all benchmarks if specified
     before any `--benchmark` arguments.
 
-* `--disable-blocking-kernel`
-  * Don't use the `blocking_kernel`.
-  * Intended for use with external profiling tools.
-  * Applies to the most recent `--benchmark`, or all benchmarks if specified
-    before any `--benchmark` arguments.
-
-* `--profile`
-  * Implies `--run-once` and `--disable-blocking-kernel`.
-  * Intended for use with external profiling tools.
-  * Applies to the most recent `--benchmark`, or all benchmarks if specified
-    before any `--benchmark` arguments.
-
 ## Stopping Criteria
 
 * `--timeout <seconds>`