docs: Better heading name for section that covers more than Placeholders

Author: claremacrae

docs/Getting Started/Obsidian Properties.md

@@ -183,7 +183,7 @@ group by function \
     return value ? window.moment(value).format('YYYY MMMM') : 'no date'
 ```
 
-## Using Query Properties in Placeholders
+## Using Query Properties in Searches
 
 > [!released]
 > Use of Obsidian properties in placeholders was introduced in Tasks X.Y.Z.

docs/Scripting/Placeholders.md

@@ -77,7 +77,7 @@ Explanation of this Tasks code block query:
 > [!released]
 > Use of Obsidian properties in placeholders was introduced in Tasks X.Y.Z.
 
-It is now possible to use properties in the query file. See [[Obsidian Properties#Using Query Properties in Placeholders]]
+It is now possible to use properties in the query file. See [[Obsidian Properties#Using Query Properties in Searches]]
 
 ## Error checking: invalid variables
 

docs/What is New/Changelog.md

@@ -14,7 +14,7 @@ _In recent [Tasks releases](https://github.com/obsidian-tasks-group/obsidian-tas
 
 - X.Y.Z:
   - Add `query.file.hasProperty()` and `query.file.property()` in custom filters
-  - Add `{{query.file.hasProperty()}}` and `{{query.file.property()}}` in placeholders - see [[Obsidian Properties#Using Query Properties in Placeholders|Using Query Properties in Placeholders]].
+  - Add `{{query.file.hasProperty()}}` and `{{query.file.property()}}` in placeholders - see [[Obsidian Properties#Using Query Properties in Searches|Using Query Properties in Placeholders]].
   - Placeholders can now call functions and contain expressions.
   - New [[Query File Defaults]] facility allows easy customising of all the
     Tasks searches in a file, by editing properties