Typo "Azure Board tools"→"Azure Boards tools" (#12109)

https://docs.microsoft.com/en-us/azure/devops/reference/xml/categories-xml-element-reference?view=azure-devops
https://github.com/MicrosoftDocs/azure-devops-docs/blob/main/docs/reference/xml/categories-xml-element-reference.md
#PingMSFTDocs

Author: hyoshioka0128

docs/reference/xml/categories-xml-element-reference.md

@@ -60,7 +60,7 @@ You use the `CATEGORIES` element to group work item types. [Use categories to gr
   
   Category friendly names are not localized and cannot be made into a token, whereas the names for work item types are localized and can be made into a token.  
   
-## Azure Board tools, category requirements, and restrictions  
+## Azure Boards tools, category requirements, and restrictions  
 
  When assigning work item types to categories, consider the following operational notes:  
   
@@ -142,4 +142,4 @@ You use the `CATEGORIES` element to group work item types. [Use categories to gr
 - [Customize your work tracking experience](../customize-work.md)
 - [Change the workflow for a work item type](change-workflow-wit.md)  
 - [ProcessConfiguration XML element reference](process-configuration-xml-element.md)  
-- [Use categories to group work item types](use-categories-to-group-work-item-types.md)
+- [Use categories to group work item types](use-categories-to-group-work-item-types.md)