Add escaping to fix formating issue

Without the escaping "<n-digit-number>" is not shown at all.
"<1-digit-number>" doesn't need any escaping, but for consistency and to
avoid confusion we add escaping for it as well.

Change-Id: I466ed256d4c97da780d34b1096d4b517194c1f96
Signed-off-by: Edwin Kempin <ekempin@google.com>

resources/Documentation/path-expressions.md

diff --git a/resources/Documentation/path-expressions.md b/resources/Documentation/path-expressions.md
index ea306cf..8045021 100644
--- a/resources/Documentation/path-expressions.md
+++ b/resources/Documentation/path-expressions.md
@@ -60,8 +60,8 @@
 | Concrete file in the current folder and in all subfolders | `{**/,}BUILD` | `BUILD` | needs 2 expressions: `BUILD` + `.../BUILD` |
 | File type in the current folder and in all subfolders | `**.md` | `*.md` or `**.md` | `....md` |
 | All files in a subfolder | `my-folder/**` | [not possible](#findOwnersCaveatMatchingFilesInSubfolder), but you can add a `my-folder/OWNERS` file instead of using a glob | `my-folder/...` |
-| All “foo-<1-digit-number>.txt” files in all subfolders | `{**/,}foo-[0-9].txt` | `foo-[0-9].txt` |not possible |
-| All “foo-<n-digit-number>.txt” files in all subfolders | not possible | not possible | not possible
+| All “foo-\<1-digit-number\>.txt” files in all subfolders | `{**/,}foo-[0-9].txt` | `foo-[0-9].txt` |not possible |
+| All “foo-\<n-digit-number\>.txt” files in all subfolders | not possible | not possible | not possible
 
 ## <a id="findOwnersCaveat">Caveat with find-owners path expressions