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doc: adjust to_timestamp()/to_date() wording
Discussion: https://postgr.es/m/20190706202425.GA16933@telsasoft.com Author: Justin Pryzby Backpatch-through: 12
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@ -6444,20 +6444,20 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
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</para>
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<para>
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If <literal>FX</literal> is specified, a separator in the template string
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matches exactly one character in input string. Notice we don't insist the
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input string character be the same as the template string separator.
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matches exactly one character in the input string. But note that the
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input string character is not required to be the same as the separator from the template string.
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For example, <literal>to_timestamp('2000/JUN', 'FXYYYY MON')</literal>
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works, but <literal>to_timestamp('2000/JUN', 'FXYYYY MON')</literal>
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returns an error because the second template string space is consumed
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by the letter <literal>J</literal> in the input string.
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returns an error because the second space in the template string consumes
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the letter <literal>J</literal> from the input string.
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</para>
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</listitem>
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<listitem>
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<para>
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A <literal>TZH</literal> template pattern can match a signed number.
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Without the <literal>FX</literal> option, it can lead to ambiguity in
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interpretation of the minus sign, which can also be interpreted as a separator.
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Without the <literal>FX</literal> option, minus signs may be ambiguous,
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and could be interpreted as a separator.
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This ambiguity is resolved as follows: If the number of separators before
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<literal>TZH</literal> in the template string is less than the number of
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separators before the minus sign in the input string, the minus sign
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