Move changelog.md notes into SYNPOSIS

[jzabroski]

It's crazy to me that the only way to figure out how to call these commands is via closely reading the CHANGELOG.md

Here is an example:

https://github.com/PowerShell/PowerShellGet/blob/f0728e01a5f972b2afbde0fd3acfee498d36ed21/CHANGELOG.md#L108-L109

Why don't you put this into an .EXAMPLES section of a .SYNOPSIS?