[explorer]: update addresses tooltip (MystenLabs#10406)

## Description 

https://mysten.atlassian.net/browse/APPS-729

<img width="752" alt="Screenshot 2023-04-04 at 2 11 15 PM"
src="https://user-images.githubusercontent.com/127577476/229923641-60528142-a726-4496-b393-13c6df2d9866.png">


## Test Plan 

How did you test the new or updated feature?

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

Co-authored-by: Phong Lam <[email protected]>

apps/explorer/src/components/HomeMetrics/index.tsx

@@ -114,7 +114,7 @@ export function HomeMetrics() {
                     />
                     <FormattedStatsAmount
                         label="Addresses"
-                        tooltip="Total addresses counter"
+                        tooltip="Addresses that have participated in at least one transaction since network genesis"
                         amount={networkMetrics?.totalAddresses}
                     />
                 </MetricGroup>