Update examples

[littlejiancc]

ExampleAddWatermarksFile

onTop = true
wm, _ = pdfcpu.ParsePDFWatermarkDetails("stamp.pdf:2", "s:.5 a, d:2", onTop)
AddWatermarksFile("in.pdf", "", nil, wm, nil)

the example for AddWatermarksFile doesn't modify，it will return ambiguous parameter prefix "s"
And can you give a explain list for the parm's ?

Thx for your great project!

[hhrutter]

Hello!
Thanks for reporting this!

😞 I need to update the examples.

Generally, you can use any unique abbreviation for all parameters in the watermark description:

So for example:

"d" is the same like "dia" is the same like "diagonal" or
"op" is the same like "opacity" but
"o" is ambiguous because there are 2 parameters starting with "o": "offset" and "opacity".

Since v0.3.3 introduced "strokeColor", "s" which used to be unique for "scaleFactor" is now ambiguous.

Short answer:
Use: "sc" or "scalefactor" for all instances in the examples where "s" is used
and "ma" for all instances where "m" is used because now we have "margins" on top of "mode" which is a synonym for "renderMode".

Don't forget to check out the documentation for stamping with pdfcpu.