docs: Fiix OTTL Span Context Table Layout (#30255)

**Description:** 

This fixes the table layout.

**Link to tracking Issue:** 

**Testing:**

Before

<img width="1167" alt="image"
src="https://github.com/open-telemetry/opentelemetry-collector-contrib/assets/82798/747c2c21-20a8-463f-9a9b-867c3b90488b">

After

<img width="1101" alt="image"
src="https://github.com/open-telemetry/opentelemetry-collector-contrib/assets/82798/0909f229-1afc-48e5-b9ba-0f7b8dafbeb9">

**Documentation:**

pkg/ottl/contexts/ottlspan/README.md

@@ -44,7 +44,6 @@ The following paths are supported.
 | end_time_unix_nano                             | the end time in unix nano of the span                                                                                                                                                                                                                                                                                                                                     | int64                                                                   |
 | start_time                                     | the start time in `time.Time` of the span                                                                                                                                                                                                                                                                                                                                 | `time.Time`                                                                   |
 | end_time                                       | the end time in `time.Time` of the span                                                                                                                                                                                                                                                                                                                                   | `time.Time`                                                                   |
-|
 | dropped_attributes_count                       | the dropped attributes count of the span                                                                                                                                                                                                                                                                                                                                  | int64                                                                   |
 | events                                         | the events of the span                                                                                                                                                                                                                                                                                                                                                    | ptrace.SpanEventSlice                                                   |
 | dropped_events_count                           | the dropped events count of the span                                                                                                                                                                                                                                                                                                                                      | int64                                                                   |