Editing special variable

Some [[variable]] names have a special meaning to the awk interpreter. == List of special variables == The following are '''special variables''' within [[awk]]: | '''Variable''' | Description | [[ARGC]] | An informative variable that provides command line parameter information | [[ARGV]] | An informative [[array]] that provides command line parameter information | [[CONVFMT]] | A control variable that specifies the conversion format of numerical strings | [[ENVIRON]] | An informative array that contains the environment strings | [[FILENAME]] | An informative variable that provides the current input [[filename]] | [[FNR]] | An informative variable that provides the number of records read from current file | [[FS]] | A control variable that specifies the input field separator | [[NF]] | An informative variable that provides the number of fields within the current record | [[NR]] | An informative variable that provides the total number of records read so far | [[OFMT]] | A control variable that specifies the output format of numerical values | [[OFS]] | A control variable that specifies the output field separator | [[ORS]] | A control variable that specifies the output record separator | [[RLENGTH]] | An informative variable that provides the length of the currently matched substring | [[RS]] | A control variable that specifies the input record separator | [[RSTART]] | An informative variable that provides the start index of the currently matched substring | [[SUBSEP]] | A control variable that specifies the subscript separator for multidimensional arrays

Summary:

This change is a minor edit.

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