Update RGBDS master documentation

Author: GitHub Action

docs/gbz80.7.pdf

@@ -271,7 +271,7 @@ <h2 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOS
       <code class="Fl">-Wall</code>.</dd>
   <dt id="Wbuiltin-args"><a class="permalink" href="#Wbuiltin-args"><code class="Fl">-Wbuiltin-args</code></a></dt>
   <dd>Warn about incorrect arguments to built-in functions, such as
-      <code class="Fn">STRSUB</code>() with indexes outside of the string's
+      <code class="Fn">STRSLICE</code>() with indexes outside of the string's
       bounds. This warning is enabled by <code class="Fl">-Wall</code>.</dd>
   <dt id="Wcharmap-redef"><a class="permalink" href="#Wcharmap-redef"><code class="Fl">-Wcharmap-redef</code></a></dt>
   <dd>Warn when re-defining a charmap mapping. This warning is enabled by

docs/rgbasm-old.5.pdf

@@ -868,12 +868,12 @@ <h3 class="Ss" id="String_expressions"><a class="permalink" href="#String_expres
   <tr id="INCHARMAP">
     <td><a class="permalink" href="#INCHARMAP"><code class="Fn">INCHARMAP</code></a>(<var class="Fa">str</var>)</td>
     <td>Returns 1 if <var class="Ar">str</var> <span class="No">has an entry in
-      the current charmap, or 0 otherwise</span>.</td>
+      the current charmap, or 0 otherwise.</span></td>
   </tr>
   <tr id="CHARLEN">
     <td><a class="permalink" href="#CHARLEN"><code class="Fn">CHARLEN</code></a>(<var class="Fa">str</var>)</td>
     <td>Returns the number of charmap entries in <var class="Ar">str</var>
-      <span class="No">with the current charmap</span>.</td>
+      <span class="No">with the current charmap.</span></td>
   </tr>
   <tr id="CHARCMP">
     <td><a class="permalink" href="#CHARCMP"><code class="Fn">CHARCMP</code></a>(<var class="Fa">str1</var>,