HPCC-31678 Fix error in ecl CLI docs for --wait param

[JamesDeFabia]

Type of change:

• This change is a bug fix (non-breaking change which fixes an issue).
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• This change is a breaking change (fix or feature that will cause existing behavior to change).
• This change alters the query API (existing queries will have to be recompiled)

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[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-31678

Jirabot Action Result:
Workflow Transition: Merge Pending
Updated PR

[afishbeckln]

@JamesDeFabia looks good.

[JamesDeFabia]

@ghalliday I believe this is good to merge. Had been stalled for a bit