Cheatsheet updates for $fe and curve resolution terminology (#170)

* s/fragments/segments/g matching wiki and dicussion

openscad/openscad#4246 (comment)

https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features

* Add $fe to cheatsheet

Not the longest phrase in the `Special variables` section

openscad/openscad#6361 merged 27 Jan 2026.

Author: coryrc

cheatsheet/index.html

@@ -66,7 +66,7 @@ <h2>Special variables</h2>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$fs">$fs</a></code></dt>
           <dd>minimum size</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$fn">$fn</a></code></dt>
-          <dd>number of fragments</dd>
+          <dd>number of segments</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$t">$t</a></code></dt>
           <dd>animation step</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$vpr">$vpr</a></code></dt>

cheatsheet/snapshot.html

@@ -77,8 +77,10 @@ <h2>Special variables</h2>
           <dd>minimum angle</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$fs">$fs</a></code></dt>
           <dd>minimum size</dd>
+          <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$fe">$fe</a></code></dt>
+          <dd>maximum discretization error</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$fn">$fn</a></code></dt>
-          <dd>number of fragments</dd>
+          <dd>number of segments</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$t">$t</a></code></dt>
           <dd>animation step</dd>
           <dt><code><a href="https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Other_Language_Features#$vpr">$vpr</a></code></dt>