Merge commit '9b0050e9aabe4be65c78ccf292a348f309d50ccd' as 'docs'

```
git subtree add --prefix=docs/ https://github.com/gohugoio/hugoDocs.git master --squash
```

Closes #11925

docs/content/en/functions/crypto/MD5.md

@@ -0,0 +1,26 @@
+---
+title: crypto.MD5
+description: Hashes the given input and returns its MD5 checksum encoded to a hexadecimal string.
+categories: []
+keywords: []
+action:
+  aliases: [md5]
+  related:
+    - functions/crypto/FNV32a
+    - functions/crypto/HMAC
+    - functions/crypto/SHA1
+    - functions/crypto/SHA256
+  returnType: string
+  signatures: [crypto.MD5 INPUT]
+aliases: [/functions/md5]
+---
+
+```go-html-template
+{{ md5 "Hello world" }} → 3e25960a79dbc69b674cd4ec67a72c62
+```
+
+This can be useful if you want to use [Gravatar](https://en.gravatar.com/) for generating a unique avatar:
+
+```html
+<img src="https://www.gravatar.com/avatar/{{ md5 "your@email.com" }}?s=100&d=identicon">
+```