Fix grammar in charter

Co-authored-by: Greg Dennis <gregsdennis@yahoo.com>

Author: Relequestual

CHARTER.md

@@ -60,7 +60,7 @@ Changes to TSC membership should be posted in the agenda, and may be suggested a
 
 TSC memberships are not time-limited.
 
-While the project is not looking to obtain "Impact" project status within the OpenJS Foundation, there is no requirement set out to limit the number of TSC members by employer. It is in some cases considered difficult or even unhelpful for the project to limit the number or percentage of TSC members by employer (Especially when an employer has employed individuals already active in the community to work exclusively on the open source project). While at this time there are no limits on TSC membership by employer, the TSC will strive to keep to at least less than 50%, ideally 33% (One third, one in three). The TSC will re-evaluate this specific clause at least every six months, and aim to revise it within one year to meet the "no more than 1/3 employer member affiliation" mandate.
+While the project is not looking to obtain "Impact" project status within the OpenJS Foundation, there is no requirement set out to limit the number of TSC members by employer. It is in some cases considered difficult or even unhelpful for the project to limit the number or percentage of TSC members by employer (especially when an employer has employed individuals already active in the community to work exclusively on the open source project). While at this time there are no limits on TSC membership by employer, the TSC will strive to keep to at least less than 50%, ideally 33% (One third, one in three). The TSC will re-evaluate this specific clause at least every six months, and aim to revise it within one year to meet the "no more than 1/3 employer member affiliation" mandate.
 
 TSC members are expected to regularly participate in TSC activities.