layers: fix spelling mistakes
diff --git a/layers/parameter_validation_utils.h b/layers/parameter_validation_utils.h
index e3489f2..7003ccd 100644
--- a/layers/parameter_validation_utils.h
+++ b/layers/parameter_validation_utils.h
@@ -538,7 +538,7 @@
                                                        "sharing an image";
         case VK_ERROR_VALIDATION_FAILED_EXT:    return "API validation has detected an invalid use of the API";
         case VK_ERROR_INVALID_SHADER_NV:        return "one or more shaders failed to compile or link";
-        default:                                return "an error has occured";
+        default:                                return "an error has occurred";
     };
     // clang-format on
 }
@@ -559,7 +559,7 @@
         if (resultName == UnsupportedResultString) {
             // Unrecognized result code
             log_msg(report_data, VK_DEBUG_REPORT_WARNING_BIT_EXT, (VkDebugReportObjectTypeEXT)0, 0, __LINE__, 1,
-                    ParameterValidationName, "%s: returned a result code indicating that an error has occured", apiName);
+                    ParameterValidationName, "%s: returned a result code indicating that an error has occurred", apiName);
         } else {
             std::string resultDesc = get_result_description(result);
             log_msg(report_data, VK_DEBUG_REPORT_WARNING_BIT_EXT, (VkDebugReportObjectTypeEXT)0, 0, __LINE__, 1,