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Doc: improve documentation about exponentiation operator.

Now that we're not having to wedge this into the straitjacket ofthe old operator table format, we can add another example toclarify the point about left-to-right associativity.Per suggestion from mdione at grulic.org.ar.https://postgr.es/m/162661954599.693.13700316547731859171@wrigleys.postgresql.org

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Original file line number	Diff line number	Diff line change
`@@ -988,16 +988,23 @@ repeat('Pg', 4) <returnvalue>PgPgPgPg</returnvalue>`
`988`	`988`	`<returnvalue>double precision</returnvalue>`
`989`	`989`	`</para>`
`990`	`990`	`<para>`
`991`		`- Exponentiation (unlike typical mathematical practice, multiple uses of`
`992`		`- <literal>^</literal> will associate left to right)`
	`991`	`+ Exponentiation`
`993`	`992`	`</para>`
`994`	`993`	`<para>`
`995`	`994`	`<literal>2 ^ 3</literal>`
`996`	`995`	`<returnvalue>8</returnvalue>`
`997`	`996`	`</para>`
	`997`	`+ <para>`
	`998`	`+ Unlike typical mathematical practice, multiple uses of`
	`999`	`+ <literal>^</literal> will associate left to right by default:`
	`1000`	`+ </para>`
`998`	`1001`	`<para>`
`999`	`1002`	`<literal>2 ^ 3 ^ 3</literal>`
`1000`	`1003`	`<returnvalue>512</returnvalue>`
	`1004`	`+ </para>`
	`1005`	`+ <para>`
	`1006`	`+ <literal>2 ^ (3 ^ 3)</literal>`
	`1007`	`+ <returnvalue>134217728</returnvalue>`
`1001`	`1008`	`</para></entry>`
`1002`	`1009`	`</row>`
`1003`	`1010`

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