cpp api doc fixes

[ghost]

A couple small fixes to the cpp docs and example

[joshmoore]

👍 Thanks, @JesseCorrington. Changes tested by copying yourcode.cpp and Makefile to target directory and compiling. That works fine, so I'd say this is ready to go for 4.4.6

In terms of usability, there might be changes you want to make moving forward:

# Building is fine works fine
@icecpp-develop target/OMERO.cpp-4.4.4-DEV-ice33-darwin-gcc-4.2.1-64dbg $ make
g++  -c -o yourcode.o yourcode.cpp -I./include -I/usr/local/opt/zeroc-ice33/include 

# For some reason, the libpath for lib/libomero_client.dylib is unhappy
@icecpp-develop target/OMERO.cpp-4.4.4-DEV-ice33-darwin-gcc-4.2.1-64dbg $ make run
g++ -o yourcode yourcode.o -L./lib -L/usr/local/opt/zeroc-ice33/lib -L/usr/local/opt/zeroc-ice33/lib64 -lIce -lIceUtil -lGlacier2 -lomero_client -lstdc++
ld: warning: directory '/usr/local/opt/zeroc-ice33/lib64' following -L not found
LD_LIBRARY_PATH=":/usr/local/opt/zeroc-ice33/lib:/usr/local/opt/zeroc-ice33/lib64:./lib" ./yourcode --Ice.Config=../etc/ice.config
dyld: Library not loaded: libomero_client.dylib
  Referenced from: target/OMERO.cpp-4.4.4-DEV-ice33-darwin-gcc-4.2.1-64dbg/./yourcode
  Reason: image not found
make: *** [run] Trace/BPT trap

# This fixes it.
@icecpp-develop target/OMERO.cpp-4.4.4-DEV-ice33-darwin-gcc-4.2.1-64dbg $ ln -s lib/libomero_client.dylib .

# This may just be an issue of my git directory being a symlink.
@icecpp-develop target/OMERO.cpp-4.4.4-DEV-ice33-darwin-gcc-4.2.1-64dbg $ make run
LD_LIBRARY_PATH=":/usr/local/opt/zeroc-ice33/lib:/usr/local/opt/zeroc-ice33/lib64:./lib" ./yourcode --Ice.Config=../etc/ice.config
terminate called after throwing an instance of 'Ice::FileException'
  what():  PropertiesI.cpp:291: Ice::FileException:
file exception: No such file or directory
path: ../etc/ice.config

I'm happy to file a ticket or you can.