docs: add missing comma

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/assert/is-almost-equal/README.md

@@ -47,7 +47,7 @@ bool = isAlmostEqual( {}, {}, 1 );
 // returns false
 ```
 
-The function returns `false` if either input value is `NaN` or in the case of [complex numbers][@stdlib/complex], if either the real or imaginary component is `NaN`.
+The function returns `false` if either input value is `NaN` or, in the case of [complex numbers][@stdlib/complex], if either the real or imaginary component is `NaN`.
 
 ```javascript
 var bool = isAlmostEqual( NaN, 1.0, 1 );