Add a description for Metrics/LineLength

Follow up #7232 (comment). This PR adds a description for `Metrics/LineLength`.
rubocop · Jul 31, 2019 · 11656e1 · 11656e1
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diff --git a/lib/rubocop/cop/metrics/line_length.rb b/lib/rubocop/cop/metrics/line_length.rb
@@ -10,6 +10,7 @@ module Metrics
       # The maximum length is configurable.
       # The tab size is configured in the `IndentationWidth`
       # of the `Layout/Tab` cop.
+      # It also ignores a shebang line by default.
       #
       # This cop has some autocorrection capabilities.
       # It can programmatically shorten certain long lines by

diff --git a/manual/cops_metrics.md b/manual/cops_metrics.md
@@ -118,6 +118,7 @@ This cop checks the length of lines in the source code.
 The maximum length is configurable.
 The tab size is configured in the `IndentationWidth`
 of the `Layout/Tab` cop.
+It also ignores a shebang line by default.
 
 This cop has some autocorrection capabilities.
 It can programmatically shorten certain long lines by