Re. `	expandPlaceholders = '**/spel.xml'`
Actually, it isn't worked:
```
Caused by: groovy.lang.GroovyRuntimeException: Failed to parse template script (your template may contain an error or be trying to use expressions not currently supported): startup failed:
SimpleTemplateScript1.groovy: 152: illegal string body character after dollar sign;
   solution: either escape a literal dollar sign "\$5" or bracket the value expression "${5}" @ line 152, column 95.
   ession=\"#jsonPath(payload, '$.store.boo
```
Because replacing is going through the Groovy's  `GString` `$`.
In some my project, when there was need to placeholders during build, I've caught the same with SI configs, who contains inline Groovy scripts. And I decided to use this one:
```
from(sourceSets.main.resources.srcDirs) {
				include '**/*.xml', '**/*.properties'
				filter(org.apache.tools.ant.filters.ReplaceTokens, tokens: replaceTokens)
			}
```
Where placeholders are from ant style - `@app_version@`
So, I suppose I'll change to 'See JavaDocs of...' and that's all