fix typos in memos collection index

docs/index.html

@@ -39,15 +39,15 @@ li {
 
 <ul>
   <li>An invaluable resource in my research was the website <a href="http://vt100.net/">vt100.net</a> which provides
-original manuals for manu VT models.</li>
+original manuals for many VT models.</li>
 
   <li>The <a href="http://invisible-island.net/xterm/ctlseqs/ctlseqs.html">Xterm manual page</a> also proved immensely useful. 
-I have even made a <a href="espterm-xterm.html">copy of it</a> with highlighted differences and missing features
+I even made a <a href="espterm-xterm.html">copy of it</a> with highlighted differences and missing features
 in ESPTerm.</li>
 
   <li>Some sequences can also be found in the <a href="https://www.gnu.org/software/screen/manual/html_node/Control-Sequences.html">GNU Screen manual page</a></li>
 
-  <li>Application keys mode became clear after reading this page:
+  <li>Application Keys Mode became clear after reading this page:
 <a href="http://www.tldp.org/HOWTO/Keyboard-and-Console-HOWTO-21.html">www.tldp.org/HOWTO/Keyboard-and-Console-HOWTO-21.html</a>.</li>
 
   <li>When trying to understand what codes should be sent by function and control 
@@ -57,8 +57,10 @@ keys, this page provided some great insight:
 
 <h2>Collected files and memos</h2>
 
-<p>Those are some documents I've found on the internet while researching for ESPTerm
-and preserve them here for reference should the original sources disappear.</p>
+<p>Those are useful documents collected from various fileservers and university
+home folders that I decided to preserve here for reference should the original 
+sources disappear (unfortunately that happens, and rare historical information 
+like this is lost).</p>
 
 <ul>
   <li><a href="./vt100.codes.txt">vt100.codes.txt</a></li>
@@ -67,7 +69,11 @@ and preserve them here for reference should the original sources disappear.</p>
   <li><a href="./shuford_terminal_vt100_codes_news.txt">shuford_terminal_vt100_codes_news.txt</a></li>
   <li><a href="./VT100 escape codes.html">VT100 escape codes.html</a></li>
   <li><a href="./Locator Input Model for ANSI Terminals (sixth revision).html">Locator Input Model for ANSI Terminals (sixth revision).html</a></li>
-  <li><a href="./codepage437.txt">codepage437.txt</a> - a file I compiled from Wikipedia</li>
 </ul>
 
+<p>Here are files I compiled from elsewhere:</p>
+
+<ul>
+  <li><a href="./codepage437.txt">codepage437.txt</a> - DOS codepage 437 (Unicode point, Symbol, DOS ASCII code)</li>
+
 <p>[End of document]</p>