Where are parameter aliases documented?

Question

Consider the output of this one-liner that discloses all the parameter aliases for Get-Content.  You can see the various parameter aliases, like Last for Tail.  Where are the parameter aliases documented?
gcm Get-Content -type Cmdlet| %{$_.name;($_.parameters | % {$_.values|ft Name,Aliases})}
Get-Content
Name Aliases
ReadCount {}
TotalCount {First, Head}
Tail {Last}
Path {}
LiteralPath {PSPath}
Filter {}
Include {}
Exclude {}
Force {}
Credential {}
Verbose {vb}
Debug {db}
ErrorAction {ea}
WarningAction {wa}
ErrorVariable {ev}
WarningVariable {wv}
OutVariable {ov}
OutBuffer {ob}
UseTransaction {usetx}
Delimiter {}
Wait {}
Raw {}
Encoding {}
Stream {}

Answer 1

They're individually documented on TechNet, for instance for Get-Content check out
http://technet.microsoft.com/en-us/library/hh849787.aspx and you can browse through the list of other cmdlets via the menu, for instance for the core cmdlets see http://technet.microsoft.com/en-us/library/hh849695.aspx
Alternatively, via the PowerShell UI you can view the syntax and parameters of any cmdlet using the Get-Help cmdlet. For instance, running :
Get-Help Get-Content -detailed
gives you a description of what the cmdlet does, what the syntax is and what each of the parameters does.