Add hyperlinks to chrome/install_static/README.md.

BUG=None
TBR=gab@chromium.org

Change-Id: Iaf363523ec156ca0789d52393545683022251699
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875087Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708483}

chrome/install_static/README.md

@@ -6,5 +6,7 @@ installation-related utility functions. It has no dependencies beyond
 kernel32.dll and version.dll, thereby making it suitable for use within
 chrome_elf.
 
-Key concepts for the library are documented in `install_modes.h`,
-`install_constants.h`, and `install_details.h`.
+Key concepts for the library are documented in
+[install_modes.h](./install_modes.h),
+[install_constants.h](./install_constants.h), and
+[install_details.h](./install_details.h).