Rename readme to markdown in toc.sh

this is for @thompson-shaun specifically

Author: tianon

toc.sh

@@ -12,8 +12,8 @@ usage() {
 	EOU
 }
 
-readme="${1:-}"
-if ! shift || [ ! -f "$readme" ]; then usage >&2; exit 1; fi
+markdown="${1:-}"
+if ! shift || [ ! -f "$markdown" ]; then usage >&2; exit 1; fi
 
 toc="$(
 	gawk '
@@ -44,10 +44,10 @@ toc="$(
 
 			printf "%s[%s](#%s)\n", prefix, $0, hash
 		}
-	' "$readme"
+	' "$markdown"
 )"
 
-toFile="${readme}.bak"
+toFile="${markdown}.bak"
 gawk -v toFile="$toFile" -v toc="$toc" '
 	BEGIN { printf "" > toFile }
 	/^<!-- AUTOGENERATED TOC -->$/ {
@@ -64,10 +64,10 @@ gawk -v toFile="$toFile" -v toc="$toc" '
 	}
 	!inToc { print >> toFile }
 	END { if (!seenToc) { close(toFile); printf "" > toFile } }
-' "$readme"
+' "$markdown"
 
 if [ -s "$toFile" ]; then
-	mv "$toFile" "$readme"
+	mv "$toFile" "$markdown"
 else
 	rm "$toFile"
 	echo "$toc"