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point out mutual coupling when d is too small

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Original file line number	Diff line number	Diff line change
`@@ -519,7 +519,7 @@ Now what happens when d is less than λ/2, such as when we need to fit the array`
`519`	`519`	`:align:center`
`520`	`520`	`:alt:Animation of direction of arrival (DOA) showing what happens when distance d is much less than half-wavelength`
`521`	`521`
`522`		`-While the main lobe gets wider as d gets lower, it still has a maximum at 20 degrees, and there are no grating lobes, so in theory this would still work (at least at high SNR). To better understand what breaks as d gets too small, let's repeat the experiment but with an additional signal arriving from -40 degrees:`
	`522`	`+While the main lobe gets wider as d gets lower, it still has a maximum at 20 degrees, and there are no grating lobes, so in theory this would still work (at least at high SNR and if mutual coupling doesn't become a major issue). To better understand what breaks as d gets too small, let's repeat the experiment but with an additional signal arriving from -40 degrees:`
`523`	`523`
`524`	`524`	`..image::../_images/doa_d_is_small_animation2.gif`
`525`	`525`	`:scale:100%`

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