Fix ID of Embarcadero C++ Compiler

[FantasqueX]

Currently there is a warning asciidoctor: WARNING: ../../src/tools/embarcadero.jam: line 10: id assigned to section already in use: bbv2.reference.tools.compiler.borland when generating documentation. It seems that ID of Embarcadero C++ Compiler is not set correctly. Since there is no use of this ID, this change should be safe.

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