Merge pull request #25902 from MihaiB/docs-link-fragment

docs: fix typo in url fragment
(cherry picked from commit ab533a98dceecec707414006544411cfd18b2d30)
Signed-off-by: Charles Smith <charles.smith@docker.com>

docs/reference/builder.md

@@ -120,7 +120,7 @@ instruction must be \`FROM\`** in order to specify the [*Base
 Image*](glossary.md#base-image) from which you are building.
 
 Docker treats lines that *begin* with `#` as a comment, unless the line is
-a valid [parser directive](builder.md#parser directives). A `#` marker anywhere
+a valid [parser directive](builder.md#parser-directives). A `#` marker anywhere
 else in a line is treated as an argument. This allows statements like:
 
 ```Dockerfile