250403.160504.CST [skip ci] fix a grammar mistake in README

Author: zaikunzhang

README.md

@@ -266,11 +266,12 @@ large constraint violation even though the starting point is feasible.
 ### Improvements
 
 Thanks to the improvements introduced into the new implementation, PRIMA
-generally produces better solutions with less function evaluations compared with Powell's Fortran 77 implementation. This makes PRIMA preferable for if function evaluations are expensive,
+generally produces better solutions with less function evaluations compared with Powell's Fortran 77 implementation.
+This makes PRIMA preferable **if function evaluations are expensive**,
 which is typically the case for [derivative-free optimization problems](https://github.com/orgs/libprima/discussions/145).
 However, if function evaluations are not the dominant cost in your application,
 The Fortran 77
-solvers are likely to be faster, as it is more efficient in terms of memory usage and flops
+solvers are likely to be faster, as they are more efficient in terms of memory usage and flops
 thanks to the careful and unique (but unmaintained) implementation by Powell.
 
 Below are the [performance profiles](https://arxiv.org/pdf/cs/0102001.pdf)

pyprima/README.md

@@ -16,7 +16,7 @@ Compared to Powell's Fortran 77 implementation, the modern-Fortran implementatio
 translation generally [produce better solutions with less function evaluations](https://github.com/libprima/prima#improvements),
 making them preferable for [applications with expensive function evaluations](https://github.com/orgs/libprima/discussions/145).
 However, if function evaluations are not the dominant cost in your application, the Fortran 77
-solvers are likely to be faster, as it is more efficient in terms of memory usage and flops
+solvers are likely to be faster, as they are more efficient in terms of memory usage and flops
 thanks to the careful and unique (but unmaintained) implementation by Powell.
 
 As of April 2025, only the COBYLA solver is available in this Python translation