Apply suggestions from code review

Co-authored-by: Richard Newman <richard.newman@thoughtbot.com>

Author: MatheusRich

ruby/conditional_modifiers.md

@@ -1,6 +1,6 @@
 # Limit use of conditional modifiers to short, simple cases
 
-Conditional modifiers (i.e., `if` or `unless` at the end of a line) be
+Conditional modifiers (i.e., `if` or `unless` at the end of a line) can be
 surprising when they appear on long or complex lines. The reader might not see
 them while scanning the code.
 
@@ -21,7 +21,7 @@ end
 ## Complex conditions
 
 However, if the line is too long (around 80 characters) or complex (e.g., an
-`if` with multiple conditions `if a && b`) prefer the multi-line form:
+`if` with multiple conditions like `if a && b`) prefer the multi-line form:
 
 ```ruby
 # Avoid