POD: improve wording, punctuation, caps

Dependencies

• [2] GMOI3OFS ResultSet::TaskRetries: add get_seconds_to_next_retry
• [3] I7Q3M7V3 TaskDispatcher: Support re-queueing tasks, and dropping tasks after 100 failures.
• [4] DHOKYWTS Hook up the retryable tasks with hydra-notify
• [5] IBXWOZCL ResultSet::TaskRetries: teach about saving tasks
• [6] SWXGVPJN hydra-notify: extract runPluginsForEvent to a TaskDispatcher

Change contents

• replacement in src/lib/Hydra/Schema/ResultSet/TaskRetries.pm at line 16
  [2.302]→[2.302:360](∅→∅)
  − If there are no tasks to be reattempted it returns undef.
  [2.302]

  [2.360]
  + If there are no tasks to be reattempted, it returns undef.
• replacement in src/lib/Hydra/Schema/ResultSet/TaskRetries.pm at line 20
  [2.416]→[2.416:484](∅→∅)
  − Otherwise, returns the number of seconds from now to look for work.
  [2.416]

  [2.484]
  + Otherwise, returns the number of seconds to wait before looking for more work.
• replacement in src/lib/Hydra/TaskDispatcher.pm at line 140
  [4.2276]→[4.2276:2344](∅→∅)
  − L<Hydra::Event> the event, usually from L<Hydra::PostgresListener>.
  [4.2276]

  [4.2344]
  + L<Hydra::Event> The event, usually from L<Hydra::PostgresListener>.
• replacement in src/lib/Hydra/TaskDispatcher.pm at line 157
  [4.2603]→[4.2603:2665](∅→∅)
  − Execute a specifi plugin against the provided L<Hydra::Task>.
  [4.2603]

  [4.2665]
  + Execute a specific plugin against the provided L<Hydra::Task>.
• replacement in src/lib/Hydra/TaskDispatcher.pm at line 168
  [4.2869]→[4.2869:2945](∅→∅)
  − L<Hydra::Task> the task, usually from L<Hydra::Shema::Result::TaskRetries>.
  [4.2869]

  [4.2945]
  + L<Hydra::Task> The task, usually from L<Hydra::Shema::Result::TaskRetries>.
• replacement in src/lib/Hydra/TaskDispatcher.pm at line 218
  [3.1960]→[3.1960:2007](∅→∅)
  − L<Hydra::Task> the task to mark as successful.
  [3.1960]

  [3.2007]
  + L<Hydra::Task> The task to mark as successful.
• replacement in src/lib/Hydra/TaskDispatcher.pm at line 246
  [3.2444]→[3.2444:2491](∅→∅)
  − L<Hydra::Task> the task to mark as successful.
  [3.2444]

  [3.2491]
  + L<Hydra::Task> The task to mark as successful.
• replacement in src/lib/Hydra/TaskDispatcher.pm at line 281
  [3.3251]→[3.3251:3297](∅→∅)
  − L<Hydra::Task> the task to return labels for.
  [3.3251]

  [3.3297]
  + L<Hydra::Task> The task to return labels for.