Docs: Remove wrong parameter for Chat Completion (#3515)

Fixes gh-3514
Signed-off-by: Thomas Vitale <ThomasVitale@users.noreply.github.com>

docs/api.md

@@ -394,7 +394,6 @@ Advanced parameters (optional):
 
 - `format`: the format to return a response in. Currently the only accepted value is `json`
 - `options`: additional model parameters listed in the documentation for the [Modelfile](./modelfile.md#valid-parameters-and-values) such as `temperature`
-- `template`: the prompt template to use (overrides what is defined in the `Modelfile`)
 - `stream`: if `false` the response will be returned as a single response object, rather than a stream of objects
 - `keep_alive`: controls how long the model will stay loaded into memory following the request (default: `5m`)