Document symbol naming convention (#105)

* Document symbol naming convention

* A bit more context on name mangling

---------

Co-authored-by: C. Brenhin Keller <cbkeller@dartmouth.edu>

Author: baggepinnen

src/StaticCompiler.jl

@@ -265,6 +265,11 @@ compile_shlib(funcs::Array, [path::String="./"]; filename="libfoo", demangle=fal
 ```
 As `compile_executable`, but compiling to a standalone `.dylib`/`.so` shared library.
 
+The compiled function is by default given the symbol name `julia_$(name)`, i.e.,
+the function `test` in the example below is called `julia_test` in the shared library.
+The keword argument `demangle=true` will remove this prefix, but is currently only
+supported the second (multi-function-shlib) method.
+
 ### Examples
 ```julia
 julia> using StaticCompiler, LoopVectorization