Blogs: add internals for interns blog link

Add a link to the "Internals For Interns" blog by jespino, which covers
Go internals topics and is available in both English and Spanish.

Change-Id: I7add76ec1aa0fab738bb4eb8d0c443cbc2c20186
GitHub-Last-Rev: 33d31eb2ad1db88d00a2942acd061e1ecc72de5b
GitHub-Pull-Request: golang/wiki#93
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/749780
Reviewed-by: Sean Liao <sean@liao.dev>

Blogs.md

diff --git a/Blogs.md b/Blogs.md
index cce7e67..bd37915 100644
--- a/Blogs.md
+++ b/Blogs.md
@@ -42,6 +42,7 @@
 - [Go articles at golang.dk](https://www.golang.dk/articles)
 - [Bitfield Consulting](https://bitfieldconsulting.com/golang)
 - [Mahmud Ridwan's Go Posts](https://hjr265.me/tags/go/)
+- [Internals For Interns](https://internals-for-interns.com/tags/go/)
 
 ## Bahasa Indonesia
 
@@ -53,6 +54,10 @@
 - [Gopher Brasil](http://gopher.net.br)
 - [Bruno Gomes's Blog](https://dev.to/bgskurono)
 
+## Spanish
+
+- [Internals For Interns](https://internals-for-interns.com/es/tags/go/)
+
 ## Chinese
 
 - [无忌-Jincheng's Blog](https://jincheng9.github.io/)