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journal: doc: more detail on transaction modifiers (#928)

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hledger-lib/hledger_journal.m4.md
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@ -1136,9 +1136,10 @@ Transaction modifier rules describe changes that should be applied automatically
Currently, this means adding extra postings (also known as "automated postings").
Transaction modifiers are enabled by the `--auto` flag.
A transaction modifier rule looks a bit like a normal transaction,
except the first line is an equals sign followed by a [query](manual.html#queries) that matches certain postings.
(mnemonic: `=` suggests matching):
A transaction modifier rule looks quite like a normal transaction,
except the first line is an equals sign followed by a [query](manual.html#queries) that matches certain postings
(mnemonic: `=` suggests matching).
And each "posting" is actually a posting-generating rule:
```journal
= QUERY
@ -1147,11 +1148,12 @@ except the first line is an equals sign followed by a [query](manual.html#querie
...
```
Each posting's amount can be:
The posting rules look just like normal postings, except the amount can be:
- a normal amount (`$2`).
- a number (`2`). This will be assigned the commodity that was used in the matched posting.
- a multiplier like `*2` (a star followed by a number N). This will be replaced by the matched posting's amount multiplied by N.
- a normal amount with a commodity symbol, eg `$2`. This will be used as-is.
- a number, eg `2`. The commodity symbol (if any) from the matched posting will be added to this.
- a numeric multiplier, eg `*2` (a star followed by a number N). The matched posting's amount (and total price, if any) will be multiplied by N.
- a multiplier with a commodity symbol, eg `*$2` (a star, number N, and symbol S). The matched posting's amount will be multiplied by N, and its commodity symbol will be replaced with S.
Some examples:
```journal