Update docs/source/design/concepts/samples_and_specimens.rst

Co-authored-by: Natasha Singh <[email protected]>

docs/source/design/concepts/samples_and_specimens.rst

@@ -4,7 +4,7 @@
 Samples and Biospecimens
 ========================
 
-Although similarly named, samples and biospecimens refer to different things:
+Although similarly named, samples and biospecimens refer to different concepts:
 
     * A **sample** is a physical piece of tissue, blood, or other material taken from a patient.
     * A **biospecimen** is a part of that sample, e.g. an aliquot of a sample.