remove text that is not needed

Author: silva96

README.adoc

@@ -1539,7 +1539,7 @@ If used without a parameter, prefer `from_now` and `ago` instead of `since`, `af
 
 [source,ruby]
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-# bad - It's not clear at first sight that the qualifier refers to the current time (which is the default parameter)
+# bad - It's not clear that the qualifier refers to the current time (which is the default parameter)
 5.hours.since
 5.hours.after
 5.hours.before
@@ -1565,7 +1565,7 @@ If used with a parameter, prefer `since`, `after`, `until` or `before` instead o
 2.days.until(yesterday)
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-Avoid using literal negative numbers for the duration subject. Always prefer using a qualifier that allows using positive literal numbers.
+Avoid using negative numbers for the duration subject. Always prefer using a qualifier that allows using positive literal numbers.
 
 [source,ruby]
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