vault: Show each task query as a text block

To make it clearer what is going on

Author: claremacrae

resources/sample_vaults/Tasks-Demo/How To/Reuse instructions across the vault.md

@@ -17,6 +17,12 @@ explain: `INPUT[toggle:TQ_explain]`
 
 (assuming there is not one called `xxxx`!)
 
+````text
+```tasks
+include xxxx
+```
+````
+
 ```tasks
 include xxxx
 ```
@@ -25,13 +31,25 @@ include xxxx
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+```
+````
+
 ```tasks
 ```
 
 ## Hide all the fields
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+include hide_all_dates
+include hide_other_fields
+```
+````
+
 ```tasks
 include hide_all_dates
 include hide_other_fields
@@ -41,6 +59,12 @@ include hide_other_fields
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+include hide_buttons
+```
+````
+
 ```tasks
 include hide_buttons
 ```
@@ -49,6 +73,12 @@ include hide_buttons
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+include just_the_description_and_tags
+```
+````
+
 ```tasks
 include just_the_description_and_tags
 ```
@@ -59,6 +89,15 @@ include just_the_description_and_tags
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+# For debug/explanatory purposes, show the source of the Include as a group name:
+group by function const x = "{{includes.filter_by_context}}"; return x
+
+{{includes.filter_by_context}}('home')
+```
+````
+
 ```tasks
 # For debug/explanatory purposes, show the source of the Include as a group name:
 group by function const x = "{{includes.filter_by_context}}"; return x
@@ -70,6 +109,16 @@ group by function const x = "{{includes.filter_by_context}}"; return x
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+# For debug/explanatory purposes, show the source of the Include as a group name:
+group by function const x = "{{includes.extract_contexts_1}}"; return x
+
+# includes.extract_contexts_1 value needs to be surrounded by parentheses ():
+filter by function return ({{includes.extract_contexts_1}})('home')
+```
+````
+
 ```tasks
 # For debug/explanatory purposes, show the source of the Include as a group name:
 group by function const x = "{{includes.extract_contexts_1}}"; return x
@@ -82,6 +131,16 @@ filter by function return ({{includes.extract_contexts_1}})('home')
 
 explain: `INPUT[toggle:TQ_explain]`
 
+````text
+```tasks
+# For debug/explanatory purposes, show the source of the Include as a group name:
+group by function const x = "{{includes.extract_contexts_2}}"; return x
+
+# includes.extract_contexts_1 value has the parentheses, to simplify use:
+filter by function {{includes.extract_contexts_2}}('home')
+```
+````
+
 ```tasks
 # For debug/explanatory purposes, show the source of the Include as a group name:
 group by function const x = "{{includes.extract_contexts_2}}"; return x