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Add description of tsvector type layout

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Original file line number	Diff line number	Diff line change
`@@ -47,6 +47,20 @@ typedef uint16 WordEntryPos;`
`47`	`47`	`#defineMAXNUMPOS256`
`48`	`48`	`#defineLIMITPOS(x) ( ( (x) >= MAXENTRYPOS ) ? (MAXENTRYPOS-1) : (x) )`
`49`	`49`
	`50`	`+/*`
	`51`	`+ * Structure of tsvector datatype:`
	`52`	`+ * 1) int4 len - varlena's length`
	`53`	`+ * 2) int4size - number of lexemes or WordEntry array, which is the same`
	`54`	`+ * 3) Array of WordEntry - sorted array, comparison based on word's length`
	`55`	`+ *and strncmp(). WordEntry->pos points number of`
	`56`	`+ *bytes from end of WordEntry array to start of`
	`57`	`+ *corresponding lexeme.`
	`58`	`+ * 4) Lexeme's storage:`
	`59`	`+ * SHORTALIGNED(lexeme) and position information if it exists`
	`60`	`+ * Position information: first int2 - is a number of positions and it`
	`61`	`+ * follows array of WordEntryPos`
	`62`	`+ */`
	`63`	`+`
`50`	`64`	`typedefstruct`
`51`	`65`	`{`
`52`	`66`	`int4len;`

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