docs: improve string description (#23604)

doc/docs.md

@@ -604,7 +604,7 @@ assert star_str == '★'
 assert star_str == '\xe2\x98\x85' // UTF-8 can be specified this way too.
 ```
 
-In V, a string is a read-only array of bytes. All Unicode characters are encoded using UTF-8:
+In V, strings are read-only, and Unicode characters are encoded in UTF-8:
 
 ```v
 s := 'hello 🌎' // emoji takes 4 bytes
@@ -626,9 +626,9 @@ s[0] = `H` // not allowed
 
 > error: cannot assign to `s[i]` since V strings are immutable
 
-Note that indexing a string will produce a `u8` (byte), not a `rune` nor another `string`. Indexes
+Note that indexing a string normally will produce a `u8` (byte), not a `rune` nor another `string`.
-correspond to _bytes_ in the string, not Unicode code points. If you want to convert the `u8` to a
+Indexes correspond to _bytes_ in the string, not Unicode code points.
-`string`, use the `.ascii_str()` method on the `u8`:
+If you want to convert the `u8` to a `string`, use the `.ascii_str()` method on the `u8`:
 
 ```v
 country := 'Netherlands'
@@ -636,6 +636,16 @@ println(country[0]) // Output: 78
 println(country[0].ascii_str()) // Output: N
 ```
 
+However, you can easily get the runes for a string with the `runes()` method, which will return an
+array of the UTF-8 characters from the string.  You can then index this array.  Just be aware that
+there may be fewer indexes available on the `rune` array than on the bytes in the string, if there
+_are_ any non-ASCII characters.
+
+```v
+mut s := 'hello 🌎'
+println(s.runes()[6])
+```
+
 If you want the code point from a specific `string` index or other more advanced 
 utf8 processing and conversions, refer to the
 [vlib/encoding.utf8](https://modules.vlang.io/encoding.utf8.html) module.