docs: update cmdlet help via platyPS merge, fix generate-help.ps1

- generate-help.ps1: rewritten to use Update-MarkdownHelp (merge) by
  default, preserving hand-written descriptions and examples. Only
  New-MarkdownHelp on genuinely new cmdlets. -Force flag for full regen.
- docs/cmdlets: parameter metadata updated via platyPS merge, CRLF
  normalized to LF
- Removed stale Send-PveIso.md (cmdlet renamed to Send-PveFile)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/cmdlets/Get-PveFirewallOptions.md

@@ -62,11 +62,11 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
-### -VmId
-The VM/Container ID. Required when Level is Vm or Container.
+### -Session
+{{ Fill Session Description }}
 
 ```yaml
-Type: Int32
+Type: PveSession
 Parameter Sets: (All)
 Aliases:
 
@@ -77,11 +77,11 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
-### -Session
-{{ Fill Session Description }}
+### -VmId
+The VM/Container ID. Required when Level is Vm or Container.
 
 ```yaml
-Type: PveSession
+Type: Int32
 Parameter Sets: (All)
 Aliases: