Update partial_read documentation

Author: stephenberry

README.md

@@ -818,7 +818,7 @@ struct opts {
   // allowed in binary, e.g. double -> float
 
   bool partial_read =
-     false; // Reads into only existing fields and elements and then exits without parsing the rest of the input
+     false; // Reads into the deepest structural object and then exits without parsing the rest of the input
 
   // glaze_object_t concepts
   bool concatenate = true; // Concatenates ranges of std::pair into single objects when writing

include/glaze/core/opts.hpp

@@ -90,7 +90,7 @@ namespace glz
       // allowed in binary, e.g. double -> float
 
       bool_t partial_read =
-         false; // Reads into only existing fields and elements and then exits without parsing the rest of the input
+         false; // Reads into the deepest structural object and then exits without parsing the rest of the input
 
       // glaze_object_t concepts
       bool_t concatenate = true; // Concatenates ranges of std::pair into single objects when writing