Correct enum value in schema for .clang-format AllowShortIfStatementsOnASingleLine

[per1234]

The AllIfsAndElse enum value had a typo in the schema for the AllowShortIfStatementsOnASingleLine property of the .clang-format configuration file.

References:

https://github.com/llvm/llvm-project/blob/llvmorg-14.0.6/clang/lib/Format/Format.cpp

  * ``SIS_AllIfsAndElse`` (in configuration: ``AllIfsAndElse``)

https://github.com/llvm/llvm-project/blob/llvmorg-14.0.6/clang/docs/ClangFormatStyleOptions.rst?plain=1#L883

template <> struct ScalarEnumerationTraits<FormatStyle::ShortIfStyle> {
  static void enumeration(IO &IO, FormatStyle::ShortIfStyle &Value) {
    IO.enumCase(Value, "Never", FormatStyle::SIS_Never);
    IO.enumCase(Value, "WithoutElse", FormatStyle::SIS_WithoutElse);
    IO.enumCase(Value, "OnlyFirstIf", FormatStyle::SIS_OnlyFirstIf);
    IO.enumCase(Value, "AllIfsAndElse", FormatStyle::SIS_AllIfsAndElse);

[madskristensen]

Thanks