docs: fix TS index definition name → accessor (#4537)

The TypeScript table index definition uses `accessor` not `name` for the
index identifier. Fixes three instances:

- `docs/docs/.../indexes.md`: two occurrences (`idx_age`,
`by_player_and_level`)
- `docs/docs/.../constraints.md`: one occurrence (`by_user_item`)

```diff
-{ name: 'by_player_and_level', algorithm: 'btree', columns: ['player_id', 'level'] }
+{ accessor: 'by_player_and_level', algorithm: 'btree', columns: ['player_id', 'level'] }
```

Co-authored-by: clockwork-labs-bot <clockwork-labs-bot@users.noreply.github.com>

Author: clockwork-labs-bot

docs/docs/00200-core-concepts/00300-tables/00240-constraints.md

@@ -105,7 +105,7 @@ const inventory = table(
     name: 'inventory',
     public: true,
     indexes: [
-      { name: 'by_user_item', algorithm: 'btree', columns: ['userId', 'itemId'] },
+      { accessor: 'by_user_item', algorithm: 'btree', columns: ['userId', 'itemId'] },
     ],
   },
   {

docs/docs/00200-core-concepts/00300-tables/00300-indexes.md

@@ -187,7 +187,7 @@ const user = table(
     name: 'user',
     public: true,
     indexes: [
-      { name: 'idx_age', algorithm: 'btree', columns: ['age'] },
+      { accessor: 'idx_age', algorithm: 'btree', columns: ['age'] },
     ],
   },
   {
@@ -256,7 +256,7 @@ const score = table(
     name: 'score',
     public: true,
     indexes: [
-      { name: 'by_player_and_level', algorithm: 'btree', columns: ['player_id', 'level'] },
+      { accessor: 'by_player_and_level', algorithm: 'btree', columns: ['player_id', 'level'] },
     ],
   },
   {