docs: code comments in move_semantics.cpp

[edmundtly]

15445-bootcamp/src/move_semantics.cpp

Line 98 in d6bd76e

// If we don't move the lvalue in the caller context to any lvalue in the

15445-bootcamp/src/move_semantics.cpp

Line 99 in d6bd76e

// callee context, then effectively the function treats the rvalue reference

Might add moving rvalue here?

  // If we don't move the rvalue from the lvalue in the caller context to any lvalue in the callee context ...