remove redundant adoc variable

Author: cportele

extensions/schemas/standard/23-058.adoc

@@ -1,4 +1,3 @@
-:Title: OGC API - Features - Part 5 / OGC API - Common - Part 3: Schemas
 :titletext: OGC API - Features - Part 5 / OGC API - Common - Part 3: Schemas
 :standard: ogcapi-common-3
 :m_n: 1.0
@@ -23,7 +22,7 @@
 :pygments-linenums-mode: table
 :stem:
 
-= {title}
+= {titletext}
 
 <<<
 [cols = ">",frame = "none",grid = "none"]