Removed unrequited ticks in the code example (#4819)

There is no need of placing command within ticks symbols if it's already placed in the code block. It breaks the output on the web page.

Author: kozhemyak

reference/3.0/Microsoft.PowerShell.Core/Invoke-Command.md

@@ -316,7 +316,7 @@ display. You can still use the **Format** cmdlets to display the **PsComputerNam
 of the affected objects.
 
 ```powershell
-`Invoke-Command` -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
+Invoke-Command -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
 ```
 
 ```Output

reference/4.0/Microsoft.PowerShell.Core/Invoke-Command.md

@@ -305,7 +305,7 @@ display. You can still use the **Format** cmdlets to display the **PsComputerNam
 of the affected objects.
 
 ```powershell
-`Invoke-Command` -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
+Invoke-Command -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
 ```
 
 ```Output

reference/5.0/Microsoft.PowerShell.Core/Invoke-Command.md

@@ -348,7 +348,7 @@ display. You can still use the **Format** cmdlets to display the **PsComputerNam
 of the affected objects.
 
 ```powershell
-`Invoke-Command` -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
+Invoke-Command -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
 ```
 
 ```Output

reference/5.1/Microsoft.PowerShell.Core/Invoke-Command.md

@@ -364,7 +364,7 @@ display. You can still use the **Format** cmdlets to display the **PsComputerNam
 of the affected objects.
 
 ```powershell
-`Invoke-Command` -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
+Invoke-Command -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
 ```
 
 ```Output

reference/6/Microsoft.PowerShell.Core/Invoke-Command.md

@@ -404,7 +404,7 @@ display. You can still use the **Format** cmdlets to display the **PsComputerNam
 of the affected objects.
 
 ```powershell
-`Invoke-Command` -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
+Invoke-Command -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
 ```
 
 ```Output

reference/7/Microsoft.PowerShell.Core/Invoke-Command.md

@@ -404,7 +404,7 @@ display. You can still use the **Format** cmdlets to display the **PsComputerNam
 of the affected objects.
 
 ```powershell
-`Invoke-Command` -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
+Invoke-Command -ComputerName S1, S2 -ScriptBlock {Get-Process PowerShell}
 ```
 
 ```Output