filter-repo: fix bitrotted documentation links

Signed-off-by: Elijah Newren <newren@gmail.com>

git-filter-repo

@@ -1705,7 +1705,7 @@ class FilteringOptions(object):
       git filter-repo --filename-callback 'return None if os.path.basename(filename) == b".DS_Store" else filename'
 
     For more detailed examples and explanations AND caveats, see
-      https://github.com/newren/git-filter-repo#callbacks
+      https://htmlpreview.github.io/?https://github.com/newren/git-filter-repo/blob/docs/html/git-filter-repo.html#CALLBACKS
 
 EXAMPLES
 
@@ -1737,7 +1737,7 @@ EXAMPLES
       git filter-repo --path src/ --to-subdirectory-filter my-module --tag-rename '':'my-module-'
 
     For more detailed examples and explanations, see
-      https://github.com/newren/git-filter-repo#examples''')
+      https://htmlpreview.github.io/?https://github.com/newren/git-filter-repo/blob/docs/html/git-filter-repo.html#EXAMPLES''')
 
     # Create the basic parser
     parser = argparse.ArgumentParser(description=summary,