fix: modified text for admin password

[imprateeksh]

Description

Refer Issue-6615

Fixed the below:

• Remove text mentioning range of admin password
• Modified the pr_tests to include passwords for administrator as greater than or equal to 15 characters.

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[imprateeksh]

/run pipeline

[imprateeksh]

/run pipeline

[imprateeksh]

/run pipeline

[shemau]

LGTM

[ocofaigh]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 1.5.1 🎉

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