ADR Bug - Fixed typo in ADR (microsoft#7113)

### Motivation and Context
<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->

All builds failing due to spellcheck violation: **serializeable** =>
**serializable**

### Description
<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->

Changed three instances of **serializeable** to **serializable**

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [X] The code builds clean without any errors or warnings
- [X] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [X] All unit tests pass, and I have added new tests where possible
- [X] I didn't break anyone 😄

docs/decisions/0046-kernel-content-graduation.md

@@ -85,7 +85,7 @@ Pros:
 - With no deferred content we have simpler API and a single responsibility for contents.
 - Can be written and read in both `Data` or `DataUri` formats.
 - Can have a `Uri` reference property, which is common for specialized contexts.
-- Fully serializeable.
+- Fully serializable.
 - Data Uri parameters support (serialization included).
 - Data Uri and Base64 validation checks
 - Data Uri and Data can be dynamically generated
@@ -197,7 +197,7 @@ Pros:
 - Can be used as a `BinaryContent` type
 - Can be written and read in both `Data` or `DataUri` formats.
 - Can have a `Uri` dedicated for referenced location.
-- Fully serializeable.
+- Fully serializable.
 - Data Uri parameters support (serialization included).
 - Data Uri and Base64 validation checks
 - Can be retrieved
@@ -254,7 +254,7 @@ Pros:
 - Can be used as a `BinaryContent` type
 - Can be written and read in both `Data` or `DataUri` formats.
 - Can have a `Uri` dedicated for referenced location.
-- Fully serializeable.
+- Fully serializable.
 - Data Uri parameters support (serialization included).
 - Data Uri and Base64 validation checks
 - Can be retrieved