test: Fix small test warnings

These were issues we should be catching.

docs/function-guide.md

@@ -342,7 +342,9 @@ method instead.
 
 ```golang
 // moduleName is already set to "math" by the math package. Do this in `init`.
-funcs.ModuleRegister(moduleName, "cos", func() interfaces.Func { return &CosFunc{} })
+funcs.ModuleRegister(moduleName, "cos", func() interfaces.Func {
+	return &CosFunc{}
+})
 ```
 
 ### Composite functions

docs/puppet-guide.md

@@ -95,7 +95,8 @@ For example, translating a plain `file` resource will lead to a warning message:
 
 ```
 $ puppet mgmtgraph print --code 'file { "/tmp/mgmt-test": }'
-Warning: File[/tmp/mgmt-test] uses the 'puppet' file bucket, which mgmt cannot do. There will be no backup copies!
+Warning: File[/tmp/mgmt-test] uses the 'puppet' file bucket, which mgmt cannot
+do. There will be no backup copies!
 ```
 
 The reason is that per default, Puppet assumes the following parameter value