Add "P" special Number character for FORMAT

Specifies that the number of values is the sample ploidy (i.e. the number of GT entries).
samtools · Aug 30, 2019 · b717f40 · b717f40
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diff --git a/VCFv4.3.pdf b/VCFv4.3.pdf
diff --git a/VCFv4.3.tex b/VCFv4.3.tex
@@ -170,7 +170,12 @@ \subsubsection{Individual format field format}
 ##FORMAT=<ID=ID,Number=number,Type=type,Description="description">
 \end{verbatim}
 
-Possible Types for FORMAT fields are: Integer, Float, Character, and String (this field is otherwise defined precisely as the INFO field).
+Possible Types for FORMAT fields are: Integer, Float, Character, and String. This field is otherwise defined as the INFO field, with the addition of special characters used to define the Number entry:
+
+\begin{itemize}
+  \item P: The field has one value per GT entry (i.e. ploidy), or zero if GT is missing.
+  The values must be in the same order as listed in the GT field.
+\end{itemize}
 
 \subsubsection{Alternative allele field format}
 Symbolic alternate alleles are described as follows: