Cleanup shortcode calls

content/en/methods/page/HasShortcode.md

@@ -13,7 +13,7 @@ By example, let's use [MathJax] to render a LaTeX mathematical expression:
 
 [MathJax]: https://www.mathjax.org/
 
-{{< code file="contents/physics/lesson-1.md" lang=markdown >}}
+{{< code file=contents/physics/lesson-1.md lang=markdown >}}
 Albert Einstein’s theory of special relativity expresses
 the fact that mass and energy are the same physical entity
 and can be changed into each other.
@@ -31,14 +31,14 @@ the kinetic energy (E) of that body.
 
 The shortcode is simple:
 
-{{< code file="layouts/shortcodes/math.html" lang=go-html-template >}}
+{{< code file=layouts/shortcodes/math.html lang=go-html-template >}}
 {{ trim .Inner "\r\n" }}
 {{< /code >}}
 
 Now we can selectively load the required CSS and JavaScript on pages that call the "math" shortcode:
 
 
-{{< code file="layouts/baseof.html" lang=go-html-template >}}
+{{< code file=layouts/baseof.html lang=go-html-template >}}
 <head>
   ...
   {{ if .HasShortcode "math" }}