fix broken markdown local links in 2019/burton/README.md

Ran `bin/readme2index.sh -v 1 2019/burton` to perform the above.

2019/burton/README.md

@@ -60,7 +60,7 @@ Compiles cleanly with:
 
 Included is a test script, useful for the corner cases.  As in all good Unix
 programs, it is silent upon success; any output demonstrates an error.  Instead
-of checking correctness, the [check.sh](%%REPO_URL%%/2019/burton/Rcheck.sh) script can simply output the
+of checking correctness, the [check.sh](%%REPO_URL%%/2019/burton/check.sh) script can simply output the
 results:   (The Makefile contains the spoiler):
 
 ``` <!---sh-->

2019/burton/index.html

@@ -425,7 +425,7 @@ The output should look familiar.</p>
 <h3 id="description">Description:</h3>
 <p>Included is a test script, useful for the corner cases. As in all good Unix
 programs, it is silent upon success; any output demonstrates an error. Instead
-of checking correctness, the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/burton/Rcheck.sh">check.sh</a> script can simply output the
+of checking correctness, the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2019/burton/check.sh">check.sh</a> script can simply output the
 results: (The Makefile contains the spoiler):</p>
 <pre><code>    out=cat ./check.sh ./prog</code></pre>
 <p>Interestingly, and a spoiler here: macOS and FreeBSD implement the common