doc: improve documentation (issue template)

Author: hozlucas28

.github/ISSUE_TEMPLATE/documentation_report.md

@@ -2,7 +2,7 @@
 name: 'Report a missing documentation'
 about: 'Basic report template with a structure to report a missing documentation.'
 title: '<Verb in infinitive> Short title related to the missing documentation'
-labels: documentation
+labels: documentation,todo
 ---
 
 -   `<Function, Macro, Structure, etc. with missing documentation>`