Creect typo.

examples/dynamics/beams/example_dynamic_beam1b.m

 %% Example Beam1b
-% A one-dimensional beam composed of two beam finite element
+% A one-dimensional beam composed of two beam finite elements
 addpath([ '..' filesep '..' filesep '..' filesep ]);
 %% Definition of sections
 s1 = mafe.Section1D();