Add two changelog entries

diff --git a/doc/news/changes/minor/20190422Jean-PaulPelteret b/doc/news/changes/minor/20190422Jean-PaulPelteret
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+New: Some utility functions that facilitate the creation of both scalar and 
+tensor symbolic variables and symbolic functions have been added to the 
+Differentiation::SD namespace.
+<br>
+(Jean-Paul Pelteret, 2019/04/22)

diff --git a/doc/news/changes/minor/20190423Jean-PaulPelteret b/doc/news/changes/minor/20190423Jean-PaulPelteret
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+New: Some utility functions that perform symbolic differentiation of scalar
+symbolic expressions, as well as tensorial expressions, have been added to the
+Differentiation::SD namespace.
+<br>
+(Jean-Paul Pelteret, 2019/04/23)