Revert "fix docx parse error(\n in alt)"

This reverts commit 663437fe16.

packages/markitdown/src/markitdown/converters/_markdownify.py

@@ -95,8 +95,6 @@ class _CustomMarkdownify(markdownify.MarkdownConverter):
         src = el.attrs.get("src", None) or ""
         title = el.attrs.get("title", None) or ""
         title_part = ' "%s"' % title.replace('"', r"\"") if title else ""
-        # Remove all line breaks from alt
-        alt = alt.replace("\n", " ")
         if (
             convert_as_inline
             and el.parent.name not in self.options["keep_inline_images_in"]