Update docs/product/explore/traces/index.mdx

Co-authored-by: Alex Krawiec <[email protected]>

Author: lizokm

docs/product/explore/traces/index.mdx

@@ -70,7 +70,7 @@ Expand a trace to see the matching spans in the following table format:
 
 - **Span ID**: Links to the span in the Trace View.
 - **Description**: Includes project, `span.op`, and `span.description`.
-- **Timeline**: Visual representation of the span's position within the trace.
+- **Timeline**: A visual representation of the span's position within the trace.
 - **Duration**: Time taken by the individual span.
 - **Timestamp**: When the span occurred.