Use the literal or :samp: role for code examples including variables
Use the literal or :samp: role for code examples including variables

Reformat uses of bold for variables, and also state
it in the "conventions" section

Change-Id: I4ac0c4b5c9138792a6aac5295b3f8c2e39d6dbbb

SanMi86/doc-kurento,SanMi86/doc-kurento,Kurento/doc-kurento,Kurento/doc-kurento,Kurento/doc-kurento,SanMi86/doc-kurento,shelsonjava/doc-kurento,SanMi86/doc-kurento,shelsonjava/doc-kurento,shelsonjava/doc-kurento,shelsonjava/doc-kurento