Improve e-series help text.

Fixes https://gitlab.com/kicad/code/kicad/issues/9349

pcb_calculator/eserie_help.h

@@ -13,8 +13,8 @@ _HKI( "E-series are defined in IEC 60063.\n"
 "- You can enter the required resistance from 0.0025 to 4000 kΩ.\n"
 "- Solutions using up to 4 components are given.\n"
 "\n"
-"By default, the request value is always excluded from the solution set.  It is also possible to specify\n"
-"up to two additional values to exclude from the solution if these component values are not available\n"
+"The requested value is always excluded from the solution set; optionally up to two additional values can be\n"
+"excluded in case of component availability problems.\n"
 "\n"
 "Solutions are given in the following formats:\n"
 "\n"