chore: fix typo in README

Improve error message from toml literal

README.md

@@ -618,7 +618,7 @@ add a comma after the first element (like `[1,]`).
 "[[table]]"_toml; // This is a table that has an array of tables inside.
 
 "[[1]]"_toml;     // This literal is ambiguous.
-                  // Currently, it becomes a table taht has array of table "1".
+                  // Currently, it becomes a table that has array of table "1".
 "1 = [{}]"_toml;  // This is a table that has an array of table named 1.
 "[[1,]]"_toml;    // This is an array of arrays.
 "[[1],]"_toml;    // ditto.

toml/literal.hpp

@@ -73,6 +73,9 @@ inline ::toml::value operator""_toml(const char* str, std::size_t len)
     if(auto data = ::toml::detail::parse_toml_file(loc))
     {
         loc.reset(loc.begin()); // rollback to the top of the literal
+        // skip needless characters for error message
+        skip_line::invoke(loc); // skip the first several needless lines
+        skip_ws::invoke(loc);   // skip the first several needless whitespaces
         return ::toml::value(std::move(data.unwrap()),
                 ::toml::detail::region<std::vector<char>>(std::move(loc)));
     }

toml/region.hpp

@@ -343,7 +343,8 @@ inline std::string format_underline(const std::string& message,
         {
             // invalid
             // ~~~~~~~
-            retval << make_string(reg->size(), '~');
+            const auto underline_len = std::min(reg->size(), reg->line().size());
+            retval << make_string(underline_len, '~');
         }
 
         retval << ' ';