Fix more typos in Readme examples

[fishrockz]

Anther missing dash and a wrong case for a option

I found these after i had submitted #114 or i would have just added them to that one, Thanks for merging so fast @Emilgardis :D

These are supper handy tools and have already helped me a load!

[rust-highfive]

r? @adamgreig

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[adamgreig]

Hah, binutils swapping from one dash to two sure left a loft of legacy in its wake. Thanks for the PR.

As far as I can see, it should be a capital -O for output target; what version of objcopy are you using that wants a lower-case -o?

[fishrockz]

I got carried away, you are quite right that copy object is using -O while strip now needs -o sorry about that.

Thanks for the review.

[fishrockz]

in regard to versions

cargo strip --release -- --version

gives:

llvm-strip, compatible with GNU strip
LLVM (http://llvm.org/):
  LLVM version 13.0.0-rust-1.60.0-nightly
  Optimized build.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: znver1

I installed via rustup component add llvm-tools-preview

Im not quite sure how the nightly got in there, some of the projects i use have nightly in rust-toolchain in some of my projects but i cant remember which directory i run the rustup command.

[bors[bot]]

Build succeeded:

• ci (1.46.0, macos-latest, false)
• ci (1.46.0, ubuntu-latest, false)
• ci (1.46.0, windows-latest, false)
• ci (stable, macos-latest, false)
• ci (stable, ubuntu-latest, false)
• ci (stable, windows-latest, false)