Remove typo

gff3.md

@@ -57,7 +57,7 @@ Undefined fields are replaced with the "." character, as described in the origin
     <dt>Column 7: "strand"</dt>
     <dd>The strand of the feature. + for positive strand (relative to the landmark), - for minus strand, and . for features that are not stranded. In addition, ? can be used for features whose strandedness is relevant, but unknown.</dd>
     <dt>Column 8: "phase"</dt>
-    <dd>f
+    <dd>
         <p>For features of type "CDS", the phase indicates where the next codon begins relative to the 5' end (where the 5' end of the CDS is relative to the strand of the CDS feature) of the current CDS feature. For clarification the 5' end for CDS features on the plus strand is the feature's start and and the 5' end for CDS features on the minus strand is the feature's end.  The phase is one of the integers 0, 1, or 2, indicating the number of bases forward from the start of the current CDS feature the next codon begins.  A phase of "0" indicates that a codon begins on the first nucleotide of the CDS feature (i.e. 0 bases forward), a phase of "1" indicates that the codon begins at the second nucleotide of this CDS feature and a phase of "2" indicates that the codon begins at the third nucleotide of this region. Note that ‘Phase’ in the context of a GFF3 CDS feature should not be confused with the similar concept of frame that is also a common concept in bioinformatics.  Frame is generally calculated as a value for a given base relative to the start of the complete open reading frame (ORF) or the codon (e.g. <codon position> modulo 3) while CDS phase describes the start of the next codon relative to a given CDS feature.</p>            
         <p>The phase is REQUIRED for all CDS features.</p>
     </dd>