refactor: update docstring placement to follow idiomatic Go convention

worker/docker.go

@@ -97,15 +97,14 @@ type DockerManager struct {
 	mu         *sync.Mutex
 }
 
+// overridePipelineImages function parses a JSON string containing pipeline-to-image mappings and overrides the default mappings if valid. 
+// It updates the `pipelineToImage` and `livePipelineToImage` maps with custom images.
+// Parameters:
+// - defaultImage: A string that can either be containerImage name or a JSON string with overrides for pipeline-to-image mappings.
+//
+// Returns:
+// - error: An error if the JSON parsing fails or if the mapping is not found in existing maps else `nil`.
 func overridePipelineImages(defaultImage string) error {
-	// overridePipelineImages function parses a JSON string containing pipeline-to-image mappings and overrides the default mappings if valid. 
-	// It updates the `pipelineToImage` and `livePipelineToImage` maps with custom images.
-	// Parameters:
-	// - defaultImage: A string that can either be containerImage name or a JSON string with overrides for pipeline-to-image mappings.
-	//
-	// Returns:
-	// - error: An error if the JSON parsing fails or if the mapping is not found in existing maps else `nil`.
-
 	// First check if the defaultImage is a valid JSON string
 	var pipelineOverrides map[string]string
 	if strings.HasPrefix(defaultImage, "{") || strings.HasSuffix(defaultImage, "}") {