Document shell expanded string defaults (#2153)
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@ -1314,6 +1314,7 @@ foobar := x'~/$FOO/${BAR}'
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| `$VAR` | value of environment variable `VAR` |
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| `${VAR}` | value of environment variable `VAR` |
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| `${VAR:-DEFAULT}` | value of environment variable `VAR`, or `DEFAULT` if `VAR` is not set |
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| Leading `~` | path to current user's home directory |
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| Leading `~USER` | path to `USER`'s home directory |
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