docs: get rid of duplicated description from sourcetree.html
docs: get rid of duplicated description from sourcetree.html

Fixes: 438086efb17 (docs: sourcetree.html misc updates)
Signed-off-by: Mun Gwan-gyeong <5492ba331463e58cf3f26f350d16c4d4d0c95f5d@gmail.com>
Reviewed-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler