(GH-789) Use PowerShell commenting, not C#

In Get-FtpFile, Get-WebFile, and Get-WebFileName, a C# comment was used
as a comment in the try catch for determining if it was a local file.
These didn't fail during local testing, but this is now fixed.

src/chocolatey.resources/helpers/functions/Get-FtpFile.ps1

@@ -79,18 +79,18 @@ param(
     return
   }
 
-  try {
-    $uri = [System.Uri]$url
-    if ($uri.IsFile()) {
-      Write-Debug "Url is local file, setting destination"
-      if ($url.LocalPath -ne $fileName) {
-        Copy-Item $uri.LocalPath -Destination $fileName -Force
-      }
-      
-      return
-    }
-  } catch {
-    //continue on
+  try {
+    $uri = [System.Uri]$url
+    if ($uri.IsFile()) {
+      Write-Debug "Url is local file, setting destination"
+      if ($url.LocalPath -ne $fileName) {
+        Copy-Item $uri.LocalPath -Destination $fileName -Force
+      }
+
+      return
+    }
+  } catch {
+    #continue on
   }
 
   # Create a FTPWebRequest object to handle the connection to the ftp server
@@ -186,10 +186,10 @@ param(
     }
 
     Set-PowerShellExitCode 404
-    if (env:DownloadCacheAvailable -eq 'true') {
-       throw "The remote file either doesn't exist, is unauthorized, or is forbidden for url '$url'. $($_.Exception.Message) `nThis package is likely not broken for licensed users - see https://chocolatey.org/docs/features-private-cdn."
-    } else {
-       throw "The remote file either doesn't exist, is unauthorized, or is forbidden for url '$url'. $($_.Exception.Message)"
+    if (env:DownloadCacheAvailable -eq 'true') {
+       throw "The remote file either doesn't exist, is unauthorized, or is forbidden for url '$url'. $($_.Exception.Message) `nThis package is likely not broken for licensed users - see https://chocolatey.org/docs/features-private-cdn."
+    } else {
+       throw "The remote file either doesn't exist, is unauthorized, or is forbidden for url '$url'. $($_.Exception.Message)"
     }
   } finally {
     if ($ftpresponse -ne $null) {

src/chocolatey.resources/helpers/functions/Get-WebFile.ps1

@@ -97,11 +97,11 @@ param(
       if ($url.LocalPath -ne $fileName) {
         Copy-Item $uri.LocalPath -Destination $fileName -Force
       }
-      
+
       return
     }
   } catch {
-    //continue on
+    #continue on
   }
 
   $req = [System.Net.HttpWebRequest]::Create($url);

src/chocolatey.resources/helpers/functions/Get-WebFileName.ps1

@@ -88,10 +88,11 @@ param(
     if ($uri.IsFile()) {
       $fileName = [System.IO.Path]::GetFileName($uri.LocalPath)
       Write-Debug "Url is local file, returning fileName"
+
       return $fileName
     }
   } catch {
-    //continue on
+    #continue on
   }
 
   $request = [System.Net.HttpWebRequest]::Create($url)