Replace odd possessives in CODE_OF_CONDUCT.md

The character being replaced looks like a backwards single quotation
mark, but may be problematic in plain-text readers (e.g. can appear like
a string of numbers in a CLI git diff).

CODE_OF_CONDUCT.md

@@ -20,7 +20,7 @@ Examples of unacceptable behavior include:
 - The use of sexualized language or imagery, and sexual attention or advances of any kind
 - Trolling, insulting or derogatory comments, and personal or political attacks
 - Public or private harassment
-- Publishing others’ private information, such as a physical or email address, without their explicit permission
+- Publishing others' private information, such as a physical or email address, without their explicit permission
 - Other conduct which could reasonably be considered inappropriate in a professional setting
 
 ## Enforcement Responsibilities
@@ -62,6 +62,6 @@ Consequence: A permanent ban from any sort of public interaction within the comm
 ## Attribution
 This Code of Conduct is adapted from the Contributor Covenant, version 2.1, available at https://www.contributor-covenant.org/version/2/1/code_of_conduct.html.
 
-Community Impact Guidelines were inspired by Mozilla’s code of conduct enforcement ladder.
+Community Impact Guidelines were inspired by Mozilla's code of conduct enforcement ladder.
 
 For answers to common questions about this code of conduct, see the FAQ at https://www.contributor-covenant.org/faq. Translations are available at https://www.contributor-covenant.org/translations.