Documentation: Fix release name

doc/index.docbook

@@ -63,7 +63,7 @@
 <legalnotice>&FDLNotice;</legalnotice>
 
 <date>2021-06-21</date>
-<releaseinfo>KDE Gears 21.04</releaseinfo>
+<releaseinfo>KDE Gear 21.04</releaseinfo>
 
 <!--Short description of this document. Do not change unless necessary!-->
 <abstract>

doc/man-kpat.6.docbook

@@ -8,7 +8,7 @@
 <title>KPat User's Manual</title>
 <date>2021-06-21</date>
 <releaseinfo>21.04</releaseinfo>
-<productname>KDE Gears</productname>
+<productname>KDE Gear</productname>
 </refentryinfo>
 
 <refmeta>