docs: import typo on the conventions example (#15999)

## Description 

Describe the changes or additions included in this PR.

It fixes a typo on the import statement of move code example.

## Test Plan 

How did you test the new or updated feature?

---
If your changes are not user-facing and do not break anything, you can
skip the following section. Otherwise, please briefly describe what has
changed under the Release Notes section.

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

- [ ] protocol change
- [ ] 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

docs/content/concepts/sui-move-concepts/conventions.mdx

@@ -90,15 +90,16 @@ module conventions::profile {
 
 module conventions::defi {
 
-  use conventions::lib::{Self, Profile};
+  use conventions::profile::{Self, Profile};
 
   public fun get_tokens(profile: &Profile) {
 
-  // ✅ Right
-  let name = profile.age();
+   // ✅ Right
+   let name = profile.age();
 
-  // ❌ Wrong
-  let name2 = profile.profile_age();
+   // ❌ Wrong
+   let name2 = profile.profile_age();
+  }
 }
 ```