Apply suggestions from code review

Author: jessica-mitchell

doc/htmldoc/whats_new/v3.8/index.rst

@@ -20,7 +20,7 @@ NMDA dynamics after Brunel and Wang (2001)
 A new integrate-and-fire model allows for the use
 simplified NMDA dynamics.
 It contains exponential conductance-based AMPA and GABA synapses along with NMDA synapses
-weighted such that it approximated the original linear dynamics.
+weighted such that it approximates the original linear dynamics.
 
 For futher information see:
 
@@ -40,7 +40,7 @@ fundamental components of creating network simulations in NEST.
 NEST performance benchmarks
 ---------------------------
 
-You can now view the results from experiments in
+You can now view results of this release in benchmarks of
 strong and weak scaling at various network sizes in our docs.
 
 * :ref:`nest_benchmark_results`