docs: sync with pro

Signed-off-by: Carlos A Becker <caarlos0@gmail.com>

www/docs/customization/templates.md

@@ -90,3 +90,25 @@ GOVERSION_NR=$(go version | awk '{print $3;}') goreleaser
 !!! warning
     Note that those are hypothetical examples and the fields `foo_template` and
     `example_template` are not valid GoReleaser configurations.
+
+## Custom variables
+
+On [GoReleaser Pro](/pro) you can also declare custom variables.
+This feature is specially useful with [includes](/customization/includes), so you can have more generic config files.
+
+Usage is as simple as you would expect:
+
+```yaml
+# .goreleaser.yml
+variables:
+  description: my project description
+  somethingElse: yada yada yada
+```
+
+And then you can use those fields as `{{ .description }}`, for example.
+
+!!! warning
+    You won't be allowed to override GoReleaser "native" fields.
+
+!!! info
+    Custom variables is a [GoReleaser Pro feature](/pro).

www/docs/pro.md

@@ -4,7 +4,8 @@ GoReleaser Pro is now available with some unique features such as:
 
 - Ability to [include](/customization/includes/) config files (useful for common configurations);
 - Improved global hooks and [global after hooks](/customization/hooks/);
-- [Monorepo support](/customization/monorepo)!
+- [Monorepo support](/customization/monorepo);
+- [Custom template variables](/customization/templates/#custom-variables) (goes well with [includes](/customization/includes/)).
 
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