Update index.mdx mention of Cody (#1437)

Author: enriquegh

docs/index.mdx

@@ -50,7 +50,7 @@ Some of the main Sourcegraph features include:
 | **Feature**         | **Description**                                                                                                                                                          |
 | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | **Deep Search**     | Natural language code search with a dedicated AI agent that explores your codebase	 																					 |
-| **Cody**            | Cody is and AI coding assistant that writes, fixes, and maintains your code                                                                                           	 |
+| **Cody**            | Cody is an AI coding assistant that writes, fixes, and maintains your code                                                                                           	 |
 | **Code Navigation** | Jump-to-definition, find references, and other IDE-like code browsing features on any branch, commit, or PR/code review                                                  |
 | **Code Insights**   | Reveal high-level information about your codebase at its current state and over time, to track migrations, version usage, vulnerability remediation, ownership, and more |
 | **Batch Changes**   | Make large-scale code changes across many repositories and codehosts                                                                                                     |