UserManual: remove obsolete reference to locks

UserManual.md

@@ -607,7 +607,5 @@ Finally, variables supplied on the command-line call to `laminarc queue`, `lamin
 - `start [JOB [PARAMS...]]...` starts one or more jobs with optional parameters, returning when the jobs begin execution.
 - `run [JOB [PARAMS...]]...` triggers one or more jobs with optional parameters and waits for the completion of all jobs. Returns a non-zero error code if any job failed.
 - `set [VARIABLE=VALUE]...` sets one or more variables to be exported in subsequent scripts for the run identified by the `$JOB` and `$RUN` environment variables
-- `lock [NAME]` acquires the [lock](#Locks) named `NAME`
-- `release [NAME]` releases the lock named `NAME`
 
 `laminarc` connects to `laminard` using the address supplied by the `LAMINAR_HOST` environment variable. If it is not set, `laminarc` will first attempt to use `LAMINAR_BIND_RPC`, which will be available if `laminarc` is executed from a script within `laminard`. If neither `LAMINAR_HOST` nor `LAMINAR_BIND_RPC` is set, `laminarc` will assume a default host of `unix-abstract:laminar`.