Update RGBDS master documentation

Author: GitHub Action

docs/gbz80.7.html

@@ -1,6 +1,6 @@
 <section class="Sh">
 <h2 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h2>
-<p class="Pp">This is the list of opcodes supported by
+<p class="Pp">This is the list of instructions supported by
     <a class="Xr" href="./rgbasm.1">rgbasm(1)</a>, including a short
     description, the number of bytes needed to encode them and the number of CPU
     cycles at 1MHz (or 2MHz in GBC double speed mode) needed to complete

docs/gbz80.7.md

@@ -1,4 +1,4 @@
-# gbz80(7) — CPU opcode reference
+# gbz80(7) — Game Boy CPU instruction reference
 
 import generated from '!!raw-loader!./gbz80.7.html';