Update stackdriver.md with warning about Workers option (fluent#1278)

* Update stackdriver.md

Adding this info about this issue because I lost a bunch of time trying to chase down intermittent restarts of my fluent-bit pods (v.2.2.0). 

Even if it defaults to 1 in newer versions, someone may override it, as was my case. 

Until the underlying issue is fixed, I think it's helpful to warn others about this.

Signed-off-by: Gerry Laracuente <[email protected]>

* Update pipeline/outputs/stackdriver.md

Co-authored-by: Braydon Kains <[email protected]>
Signed-off-by: Gerry Laracuente <[email protected]>

* Update pipeline/outputs/stackdriver.md

Co-authored-by: Braydon Kains <[email protected]>
Signed-off-by: Gerry Laracuente <[email protected]>

* Update stackdriver.md

Signed-off-by: Gerry Laracuente <[email protected]>

---------

Signed-off-by: Gerry Laracuente <[email protected]>
Co-authored-by: Braydon Kains <[email protected]>

Author: gerry-tock

pipeline/outputs/stackdriver.md

@@ -184,7 +184,13 @@ Do following check:
 * If the log entry does not contain the local_resource_id field, does the tag of the log match for format?
 *   If tag_prefix is configured, does the prefix of tag specified in the input plugin match the tag_prefix?
 
-    **Other implementations**
+### Occasional Crashing with >1 `Workers`
+
+> Github reference: [#7552](https://github.com/fluent/fluent-bit/issues/7552)
+
+When the number of Workers is greater than 1, Fluent Bit may interimittently crash.
+
+## Other implementations
 
 Stackdriver officially supports a [logging agent based on Fluentd](https://cloud.google.com/logging/docs/agent).