GH-41386: [Docs] Document Arrow Go Avro read support (#41393)

Updates the Implementation Status docs page to reflect that the Go
implementation can read Avro files.

For the Rust implementation, I inferred from [this
PR](apache/arrow-rs#4886) and [this
comment](apache/arrow-rs#5562 (comment))
that we should hold off on indicating that the Rust implementation can
read Avro files.

* GitHub Issue: #41386

docs/source/status.rst

@@ -353,7 +353,7 @@ Third-Party Data Formats
 | Format                      | C++     | Java    | Go    | JS | C#    | Rust  | Julia | Swift |
 |                             |         |         |       |    |       |       |       |       |
 +=============================+=========+=========+=======+====+=======+=======+=======+=======+
-| Avro                        |         | R       |       |    |       |       |       |       |
+| Avro                        |         | R       | R     |    |       |       |       |       |
 +-----------------------------+---------+---------+-------+----+-------+-------+-------+-------+
 | CSV                         | R/W     | R (2)   | R/W   |    |       | R/W   | R/W   |       |
 +-----------------------------+---------+---------+-------+----+-------+-------+-------+-------+