[Security Solution] Grammatical error in validation message for threshold field Custom Rule Creation

Describe the bug
Grammatical error in validation message for threshold field Custom Rule Creation

Build Details:

Elastic-Stack : 7.10.0 BC4
Commit: 3f7bbe02a2f08f0ad1c7f5a9b35235a4aa066a32
Build: 35887
Artifacts: https://staging.elastic.co/7.10.0-c650b297/summary-7.10.0.html

Browser Details
All

Preconditions

1. Elastic Cloud 7.10.0 environment should be deployed
2. Auditbeat should be running.

Steps to Reproduce

1. Navigate to Create new rule under Security > Detection.
2. Select Threshold card.
3. Enter custom query: host.name: *
4. Select as Field: host.name
5. Select as Threshold 0
6. Observe that "Value must be greater than or equal one" validation message is displaying instead of "Value must be greater than or equal to one."

Impacted Test case(s)
N/A

Actual Result
A grammatical error in validation message under threshold field when create threshold rule.

Expected Result
"Value must be greater than or equal to one." should be displayed under threshold field when create threshold rule.

What's Working
N/A

What's not Working
N/A

Screenshot:

@karanbirsingh-qasource Please review

Reviewed and assigned to @MadameSheema