docs: add notes

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---

Author: kgryte

lib/node_modules/@stdlib/number/uint8/base/add/README.md

@@ -63,6 +63,10 @@ v = add( 0, 5 );
 
 <section class="notes">
 
+## Notes
+
+-   The function performs C-like addition of two unsigned 8-bit integers, including wraparound semantics.
+
 </section>
 
 <!-- /.notes -->

lib/node_modules/@stdlib/number/uint8/base/mul/README.md

@@ -63,6 +63,10 @@ v = mul( 5, 0 );
 
 <section class="notes">
 
+## Notes
+
+-   The function performs C-like multiplication of two unsigned 8-bit integers, including wraparound semantics.
+
 </section>
 
 <!-- /.notes -->

lib/node_modules/@stdlib/number/uint8/base/sub/README.md

@@ -63,6 +63,10 @@ v = sub( 5, 0 );
 
 <section class="notes">
 
+## Notes
+
+-   The function performs C-like subtraction of two unsigned 8-bit integers, including wraparound semantics.
+
 </section>
 
 <!-- /.notes -->