[UX]: Update copy for dashboard snapshot time selector & active accounts tooltip

[donouwens]

IMPACT

• [ ] High
• [ ] Medium
• [X] Low

URGENCY

• [ ] Critical
• [ ] Major
• [ ] Medium
• [X] Minor

PRODUCT ENVIRONMENT

No response

DESCRIPTION OF ISSUE

Updated copy in the snapshot time dropdown to be clearer. Link to design: https://www.figma.com/file/8dwSyYOOm3vlgbvxPGT29p/Block-Explorer-(Post-Launch)?type=design&node-id=9834%3A66887&mode=design&t=Y4hz2GWCF5F0cFJf-1

Added a hover tooltip with an explanation on why we only show active accounts - Link to design: https://www.figma.com/file/8dwSyYOOm3vlgbvxPGT29p/Block-Explorer-(Post-Launch)?type=design&node-id=9843%3A68270&mode=design&t=Y4hz2GWCF5F0cFJf-1

DEVICE / VIEWPORT

• [ ] Desktop
• [ ] Mobile

STEPS TO REPRODUCE

No response

ALTERNATIVES AND SUGGESTIONS

No response