docs: Tweak some minor things to keep wikiheaders happy.

You can't have two sections with the same name (so it can generate unique
page anchors), so fix one of these, and tweak another thing that _isn't_ a
header but wikiheader's quick-and-dirty parser thinks is one.

docs/README-cmake.md

@@ -157,7 +157,7 @@ flags to the compiler.
 - Use [`CMAKE_EXE_LINKER_FLAGS`](https://cmake.org/cmake/help/latest/variable/CMAKE_EXE_LINKER_FLAGS.html) to pass extra option to the linker for executables.
 - Use [`CMAKE_SHARED_LINKER_FLAGS`](https://cmake.org/cmake/help/latest/variable/CMAKE_SHARED_LINKER_FLAGS.html) to pass extra options to the linker for shared libraries.
 
-#### Examples
+#### Compile Options Examples
 
 - build a SDL library optimized for (more) modern x64 microprocessor architectures.
 
@@ -240,7 +240,7 @@ Append with a version number to target a specific SDK revision: e.g. `iphoneos12
 
 CMake documentation: [link](https://cmake.org/cmake/help/latest/variable/CMAKE_OSX_SYSROOT.html)
 
-#### Examples
+#### Apple Examples
 
 - for macOS, building a dylib and/or static library for x86_64 and arm64:
 

docs/README-emscripten.md

@@ -230,7 +230,7 @@ tools.
 mkdir build
 cd build
 emcmake cmake ..
-# you can also do `emcmake cmake -G Ninja ..` and then use `ninja` instead of this command.
+# you can also try `emcmake cmake -G Ninja ..` and then use `ninja` instead of this command.
 emmake make -j4
 ```