The L, M, and S sizes vary individually by the camera, but the numbers at the top in the blue bar tell you the pixel dimensions. So, in this case, your L size images are 5760x3840 (or 22MP). The larger the size you choose, the bigger the file will be, but the higher the resolution and the larger you can print out the image.
If you view our crops of the resolution chart's central section at 100% (or Actual Pixels) you will see that, for example, at ISO 100 the Canon 1100D is capable of resolving up to nearly 24
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canon 1100d pixel size