Fix merge conflict residue in XmlProvider.fs: correct arg indices and list syntax

After PR #1629 (UseOriginalNames) was merged into main, the DtdProcessing branch
had a merge conflict residue in XmlProvider.fs:

1. Both dtdProcessing and useOriginalNames were assigned from args.[11]
   - dtdProcessing should be args.[11] (DtdProcessing param, index 11)
   - useOriginalNames should be args.[12] (UseOriginalNames param, index 12)

2. The static parameters list had two closing brackets causing a syntax
   error that Fantomas could not parse.

3. The helpText had a duplicate triple-quote after the DtdProcessing param doc.

Build verified (0 errors), Fantomas clean.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

src/FSharp.Data.DesignTime/Xml/XmlProvider.fs

@@ -52,7 +52,7 @@ type public XmlProvider(cfg: TypeProviderConfig) as this =
         let inferenceMode = args.[9] :?> InferenceMode
         let preferDateOnly = args.[10] :?> bool
         let dtdProcessing = args.[11] :?> string
-        let useOriginalNames = args.[11] :?> bool
+        let useOriginalNames = args.[12] :?> bool
 
         let inferenceMode =
             InferenceMode'.FromPublicApi(inferenceMode, inferTypesFromValues)
@@ -202,7 +202,7 @@ type public XmlProvider(cfg: TypeProviderConfig) as this =
               parameterDefaultValue = InferenceMode.BackwardCompatible
           )
           ProvidedStaticParameter("PreferDateOnly", typeof<bool>, parameterDefaultValue = false)
-          ProvidedStaticParameter("DtdProcessing", typeof<string>, parameterDefaultValue = "Ignore") ]
+          ProvidedStaticParameter("DtdProcessing", typeof<string>, parameterDefaultValue = "Ignore")
           ProvidedStaticParameter("UseOriginalNames", typeof<bool>, parameterDefaultValue = false) ]
 
     let helpText =
@@ -228,7 +228,7 @@ type public XmlProvider(cfg: TypeProviderConfig) as this =
               Note inline schemas are not used from Xsd documents.
            </param>
            <param name='PreferDateOnly'>When true on .NET 6+, date-only strings are inferred as DateOnly and time-only strings as TimeOnly. Defaults to false for backward compatibility.</param>
-           <param name='DtdProcessing'>Controls how DTD declarations in the XML are handled. Accepted values: "Ignore" (default, silently skips DTD processing, safe for most cases), "Prohibit" (throws on any DTD declaration), "Parse" (enables full DTD processing including entity expansion, use with caution).</param>"""
+           <param name='DtdProcessing'>Controls how DTD declarations in the XML are handled. Accepted values: "Ignore" (default, silently skips DTD processing, safe for most cases), "Prohibit" (throws on any DTD declaration), "Parse" (enables full DTD processing including entity expansion, use with caution).</param>
            <param name='UseOriginalNames'>When true, XML element and attribute names are used as-is for generated property names instead of being normalized to PascalCase. Defaults to false.</param>"""