Fix documentation (#58)

Fixed minor typos and inconsistencies in the comments of
client.go and embed.go.

genai/client.go

@@ -279,7 +279,7 @@ func (e *BlockedError) Error() string {
 	return b.String()
 }
 
-// joinResponses  merges the two responses, which should be the result of a streaming call.
+// joinResponses merges the two responses, which should be the result of a streaming call.
 // The first argument is modified.
 func joinResponses(dest, src *GenerateContentResponse) *GenerateContentResponse {
 	if dest == nil {

genai/client_test.go

@@ -482,6 +482,8 @@ func printValue(v reflect.Value, indent, first string, printf func(string, ...an
 					printValue(vf, indent1, sf.Name+": ", printf)
 				}
 			}
+		default:
+			panic("unhandled default case")
 		}
 		printf("%s}\n", indent)
 	case reflect.Pointer, reflect.Interface:

genai/embed.go

@@ -86,7 +86,7 @@ type EmbeddingBatch struct {
 }
 
 // NewBatch returns a new, empty EmbeddingBatch with the same TaskType as the model.
-// Make multiple calls to [EmbeddingBatch.AddContent] or EmbeddingBatch.AddContentWithTitle].
+// Make multiple calls to [EmbeddingBatch.AddContent] or [EmbeddingBatch.AddContentWithTitle].
 // Then pass the EmbeddingBatch to [EmbeddingModel.BatchEmbedContents] to get
 // all the embeddings in a single call to the model.
 func (m *EmbeddingModel) NewBatch() *EmbeddingBatch {