Update RGBDS master documentation

Author: GitHub Action

docs/gbz80.7.pdf

@@ -41,8 +41,10 @@ <h2 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIP
   <dt id="b"><a class="permalink" href="#b"><code class="Fl">-b</code></a>
     <var class="Ar">chars</var>, <code class="Fl">--binary-digits</code>
     <var class="Ar">chars</var></dt>
-  <dd>Change the two characters used for binary constants. The defaults are
-    01.</dd>
+  <dd>Allow two characters to be used for binary constants in addition to the
+      default &#x2018;0&#x2019; and &#x2018;1&#x2019;. Valid characters are
+      numbers other than &#x2018;0&#x2019; and &#x2018;1&#x2019;, letters,
+      &#x2018;.&#x2019;, &#x2018;#&#x2019;, or &#x2018;@&#x2019;.</dd>
   <dt id="D"><a class="permalink" href="#D"><code class="Fl">-D</code></a>
     <var class="Ar">name</var>[=<var class="Ar">value</var>],
     <code class="Fl">--define</code>
@@ -61,8 +63,11 @@ <h2 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIP
   <dt id="g"><a class="permalink" href="#g"><code class="Fl">-g</code></a>
     <var class="Ar">chars</var>, <code class="Fl">--gfx-chars</code>
     <var class="Ar">chars</var></dt>
-  <dd>Change the four characters used for gfx constants. The defaults are
-    0123.</dd>
+  <dd>Allow four characters to be used for graphics constants in addition to the
+      default &#x2018;0&#x2019;, &#x2018;1&#x2019;, &#x2018;2&#x2019;, and
+      &#x2018;3&#x2019;. Valid characters are numbers other than
+      &#x2018;0&#x2019; to &#x2018;3&#x2019;, letters, &#x2018;.&#x2019;,
+      &#x2018;#&#x2019;, or &#x2018;@&#x2019;. The defaults are 0123.</dd>
   <dt id="h"><a class="permalink" href="#h"><code class="Fl">-h</code></a>,
     <code class="Fl">--help</code></dt>
   <dd>Print help text for the program and exit.</dd>