Updated Query with Indexes to be code-accurate (#4165)

# Description of Changes

Implements the fix for #4130 by updating docs with accurate usage
instructions for Query with Indexes in C#.

# API and ABI breaking changes

Docs only, no API or ABI changes

# Expected complexity level and risk

1

# Testing

- [X] Tested code snippets through addition of regression tests in #4123

Co-authored-by: John Detter <4099508+jdetter@users.noreply.github.com>

Author: rekhoff

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

@@ -402,13 +402,27 @@ for (const user of ctx.db.user.age.filter(
 <TabItem value="csharp" label="C#">
 
 ```csharp
-// Find users aged 18 or older
-foreach (var user in ctx.Db.User.Age.Filter(new Bound<byte>.Inclusive(18), null))
+// Find users aged 18 to 65 (inclusive)
+foreach (var user in ctx.Db.User.Age.Filter(new Bound<byte>(18, 65)))
+{
+    Log.Info($"{user.Name} is {user.Age}");
+}
+
+// Find users aged 18 or older (inclusive, unbounded above)
+foreach (var user in ctx.Db.User.Age.Filter(new Bound<byte>(18, byte.MaxValue)))
 {
     Log.Info($"{user.Name} is an adult");
 }
+
+// Find users younger than 18 (unbounded below, to 17 inclusive)
+foreach (var user in ctx.Db.User.Age.Filter(new Bound<byte>(byte.MinValue, 17)))
+{
+    Log.Info($"{user.Name} is a minor");
+}
 ```
 
+You can also use the implicit tuple conversion, like `ctx.Db.User.Age.Filter((18, byte.MaxValue))`, which is functionally identical.
+
 </TabItem>
 <TabItem value="rust" label="Rust">