Fix a few typos (#701)

also expand OSes, arguably easier to understand

Author: fingolfin

docs/src/devdocs/binaries_part_2.md

@@ -14,7 +14,7 @@ calling into the Julia runtime library (`libjulia`) from a C program.  A quite
 detail set of docs for how this is done can be found at the [embedding chapter
 in the Julia manual](https://docs.julialang.org/en/v1/manual/embedding/) and it
 is recommended to read before reading on.  Since this is supposed to highlight
-the interals of PackageCompiler, will not use the conveniences shown in that
+the internals of PackageCompiler, will not use the conveniences shown in that
 section (e.g. the `julia-config.jl` script) but it is good to know they exist.
 
 A rough outline of the steps we will take to create an executable are:
@@ -96,7 +96,7 @@ julia --startup-file=no --trace-compile=app_precompile.jl MyApp.jl "FL_insurance
 
 The `custom_sysimage.jl` script look similar to before with the exception that
 we added an include of the app file inside the anonymous module where the
-precompiliation statements are evaluated in:
+precompilation statements are evaluated in:
 
 ```julia
 Base.init_depot_path()

docs/src/devdocs/relocatable_part_3.md

@@ -209,7 +209,7 @@ The plan is that on macOS and Linux the files are structured as:
 On Windows, we will just store everything in `bin` due to no convenient way of using `RPATH`.
 
 We create a new folder `lib` and copy the libraries into it (and remove the
-sysimage, since we will create cusom sysimage anyway):
+sysimage, since we will create custom sysimage anyway):
 
 ```
 ~/MyApp

docs/src/libs.md

@@ -87,7 +87,7 @@ Here you have different options depending on your operating system and needs.
 
 1. Install the libraries in a non-standard location, and update an appropriate environment
    variable to point to the library location.
-   * On Linux and other Unix-like OSes, run `export LD_LIBRARY_PATH=/path/to/lib:$LD_LIBRARY_PATH`
+   * On Linux and other Unix-like operating systems, run `export LD_LIBRARY_PATH=/path/to/lib:$LD_LIBRARY_PATH`
    * On Mac, run `export DYLD_FALLBACK_LIBRARY_PATH=/path/to/lib:$DYLD_FALLBACK_LIBRARY_PATH`
    * On Windows, include the library location in `PATH`. (* NOTE: not tested--does this work? *)