Further overhaul of package line comments.

core/unicode/doc.odin

@@ -1,2 +1,2 @@
-// package unicode provides data and procedures to test properties of Unicode code points
+// Data and procedures to test properties of `Unicode` code points.
 package unicode

core/unicode/utf16/utf16.odin

@@ -1,4 +1,4 @@
-// package utf16 implements procedures and constants to support text-encoding in the UTF-16 character encoding
+// Procedures and constants to support text-encoding in the `UTF-16` character encoding.
 package utf16
 
 import "core:unicode/utf8"

core/unicode/utf8/utf8.odin

@@ -1,4 +1,4 @@
-// package utf8 implements procedures and constants to support text-encoding in the UTF-8 character encoding
+// Procedures and constants to support text-encoding in the `UTF-8` character encoding.
 package utf8
 
 RUNE_ERROR :: '\ufffd'

core/unicode/utf8/utf8string/string.odin

@@ -1,4 +1,4 @@
-// package utf8string provides a convenient and efficient way to index strings by Unicode code point (rune) rather than byte
+// A convenient and efficient way to index strings by `Unicode` code point (`rune`) rather than byte.
 package utf8string
 
 import "core:unicode/utf8"