[GlobPattern][docs] Fix poorly rendered docs

In #65397 I attempted to fix these docs by adding a "." but that didn't
seem to work. This tries to use two newlines to divide paragraphs.

Author: ellishg

llvm/include/llvm/Support/GlobPattern.h

@@ -35,15 +35,17 @@ namespace llvm {
 ///   brace expansions are not supported and characters \p "{,}" are treated as
 ///   literals.
 /// * \p "\" escapes the next character so it is treated as a literal.
-/// .
+///
+///
 /// Some known edge cases are:
 /// * \p "]" is allowed as the first character in a character class, i.e.,
 ///   \p "[]]" is valid and matches the literal \p "]".
 /// * The empty character class, i.e., \p "[]", is invalid.
 /// * Empty or singleton brace expansions, e.g., \p "{}", \p "{a}", are invalid.
 /// * \p "}" and \p "," that are not inside a brace expansion are taken as
 ///   literals, e.g., \p ",}" is valid but \p "{" is not.
-/// .
+///
+///
 /// For example, \p "*[/\\]foo.{c,cpp}" will match (unix or windows) paths to
 /// all files named \p "foo.c" or \p "foo.cpp".
 class GlobPattern {