Improve prefix resolution documentation

COMMANDS.md

@@ -229,7 +229,13 @@ Then install the desired versions:
       2.6.8
     * 2.7.6 (set by /home/yyuu/.pyenv/version)
 
-To install the latest version of Python without giving a specific version use the `:latest` syntax. For example, to install the latest patch version for Python 3.8 you could do:
+You can also install the latest version of Python in a specific version line by supplying a prefix instead of a complete name:
+
+    $ pyenv install 3.10
+
+See the [`pyenv latest` documentation](#pyenv-latest) for details on prefix resolution.
+
+An older option is to use the `:latest` syntax. For example, to install the latest patch version for Python 3.8 you could do:
 
     pyenv install 3.8:latest
 

README.md

@@ -418,6 +418,8 @@ while switching -- the latest installed version.
 You can run [`pyenv latest <prefix>`](COMMANDS.md#pyenv-latest) to see
 what a specific prefix would be resolved to.
 
+See the [`pyenv latest` documentation](COMMANDS.md#pyenv-latest) for details on the resolution process.
+
 
 #### Python versions with extended support