Fix typo in community-membership.md and remove update date (#1313)

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Author: arminru

community-membership.md

@@ -1,7 +1,5 @@
 # Community membership
 
-Last updated: 2021-05-27
-
 This doc outlines the various responsibilities of contributor roles in
 OpenTelemetry. The OpenTelemetry project is subdivided into subprojects under
 (predominantly, but not exclusively) language-focused SIGs (Special Interest
@@ -14,7 +12,7 @@ delegated. They can be reached via e-mail cncf-opentelemetry-governance@lists.cn
 | ---------- | ----------------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
 | member     | active contributor in the community.  reviewer of PRs | sponsored by 2 approvers or maintainers. multiple contributions to the project. | OpenTelemetry GitHub org member.                             |
 | triager     | assist with project management and backlog organization. | nominated by a maintainer. attend meetings for one month. |  CONTRIBUTING, CODEOWNERS, or the README. |
-| approver   | approve accepting contributions                       | highly experienced and active reviewer + contributor to a subproject | [CODEOWNERS](https://help.github.com/en/articles/about-code-owners) in GitHub |
+| approver   | approve incoming contributions                        | highly experienced and active reviewer + contributor to a subproject | [CODEOWNERS](https://help.github.com/en/articles/about-code-owners) in GitHub |
 | maintainer | set direction and priorities for a subproject         | demonstrated responsibility and excellent technical judgement for the subproject | [CODEOWNERS](https://help.github.com/en/articles/about-code-owners), GitHub Team and repo ownership in GitHub |
 | emeritus   | position of honor for former maintainers, approvers, and triagers        | must have previously held a community role and not have been removed from that role for a [Code of Conduct](code-of-conduct.md) violation. | Listed as an emeritus maintainer/approver/triager in CONTRIBUTING, CODEOWNERS, or README |