Change copy to clarify that Verifying wallet is an optional task

[jenn-rhim]

Description

Please change the wording in the dialog below. @NejcZdovc

Steps to Reproduce

Actual result:

Expected result:

Reproduces how often:

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release?
• Can you reproduce this issue with the beta channel?
• Can you reproduce this issue with the dev channel?
• Can you reproduce this issue with the nightly channel?

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

[LaurenWags]

Verified passed with

Brave	1.3.85 Chromium: 79.0.3945.88 (Official Build) beta (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	macOS Version 10.14.6 (Build 18G103)

• Verified test plan from Updates copy for verify modal brave-core#4099
• Verified when accessing the wallet modal from Verify Wallet button, Add Funds, Withdraw Funds, and verify links on brave://rewards
• Verified when accessing the wallet modal from Verify Wallet button and Add Funds from BR panel

Verification passed on

Brave	1.3.85 Chromium: 79.0.3945.88 (Official Build) beta (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified test plan from Updates copy for verify modal brave-core#4099
• Verified when accessing the wallet modal from Verify Wallet button, Add Funds, Withdraw Funds, and verify links on brave://rewards
• Verified when accessing the wallet modal from Verify Wallet button and Add Funds from BR panel
  

Verification passed on

Brave	1.3.85 Chromium: 79.0.3945.88 (Official Build) beta (64-bit)
Revision	c2a58a36b9411c80829b4b154bfcab97e581f1f3-refs/branch-heads/3945@{#954}
OS	Ubuntu 18.04 LTS

• Verified test plan from Updates copy for verify modal brave-core#4099
• Verified when accessing the wallet modal from Verify Wallet button, Add Funds, Withdraw Funds, and verify links on brave://rewards
• Verified when accessing the wallet modal from Verify Wallet button and Add Funds from BR panel