fix(#2873): renamed sigma

eo-maven-plugin/src/main/resources/org/eolang/maven/phi/to-phi.xsl

@@ -42,7 +42,7 @@ SOFTWARE.
   <xsl:variable name="rho">
     <select>ρ</select>
   </xsl:variable>
-  <xsl:variable name="home">
+  <xsl:variable name="sigma">
     <select>σ</select>
   </xsl:variable>
   <xsl:variable name="program">
@@ -105,11 +105,11 @@ SOFTWARE.
       </xsl:when>
       <xsl:when test="$n='&amp;'">
         <xsl:value-of select="eo:add-xi(not($is-name))"/>
-        <xsl:value-of select="$home"/>
+        <xsl:value-of select="$sigma"/>
       </xsl:when>
       <xsl:when test="$n='.&amp;'">
         <xsl:text>.</xsl:text>
-        <xsl:value-of select="$home"/>
+        <xsl:value-of select="$sigma"/>
       </xsl:when>
       <xsl:when test="$n='$'">
         <xsl:value-of select="$xi"/>
@@ -243,14 +243,14 @@ SOFTWARE.
   <xsl:template match="*" mode="path">
     <xsl:param name="find"/>
     <xsl:variable name="parent" select="parent::*"/>
-    <xsl:variable name="rho-dot">
+    <xsl:variable name="sigma-dot">
       <xsl:value-of select="eo:specials('&amp;', true())"/>
       <xsl:text>.</xsl:text>
     </xsl:variable>
     <xsl:choose>
       <xsl:when test="$parent[@abstract]">
         <xsl:if test="not($parent/o[@name=$find])">
-          <xsl:value-of select="$rho-dot"/>
+          <xsl:value-of select="$sigma-dot"/>
           <xsl:apply-templates select="$parent" mode="path">
             <xsl:with-param name="find" select="$find"/>
           </xsl:apply-templates>