Documentation, comments and code formatting improvements

Small documentation corrections.

Improve comments in codes, spelling corrections, comment formatting

Wrap long source code lines so there are fewer lines over 80 columns and very few over 120 columns

NO changes to actual source or interface
diff --git a/test/float_tests.h b/test/float_tests.h
index b7174c8..f3acb71 100644
--- a/test/float_tests.h
+++ b/test/float_tests.h
@@ -1,14 +1,14 @@
 /*==============================================================================
  float_tests.h -- tests for float and conversion to/from half-precision
 
- Copyright (c) 2018-2019, Laurence Lundblade. All rights reserved.
+ Copyright (c) 2018-2020, Laurence Lundblade. All rights reserved.
 
  SPDX-License-Identifier: BSD-3-Clause
 
  See BSD-3-Clause license in README.md
 
  Created on 9/19/18
- ==============================================================================*/
+ =============================================================================*/
 
 #ifndef float_tests_h
 #define float_tests_h