Fix typo (#4987)

**Which issue(s) this PR fixes**: 
Fixes #

**What this PR does / why we need it**: 
This PR will fix misspell.

**Docs Changes**:

**Release Note**:

Signed-off-by: Shizuo Fujita <fujita@clear-code.com>

Author: Watson1978

lib/fluent/command/cap_ctl.rb

@@ -28,11 +28,11 @@ def prepare_option_parser
         @opts[:clear_capabilities] = true
       }
 
-      @op.on('--add [CAPABILITITY1,CAPABILITY2, ...]', "Add capabilities into Fluentd Ruby") {|s|
+      @op.on('--add [CAPABILITY1,CAPABILITY2, ...]', "Add capabilities into Fluentd Ruby") {|s|
         @opts[:add_capabilities] = s
       }
 
-      @op.on('--drop [CAPABILITITY1,CAPABILITY2, ...]', "Drop capabilities from Fluentd Ruby") {|s|
+      @op.on('--drop [CAPABILITY1,CAPABILITY2, ...]', "Drop capabilities from Fluentd Ruby") {|s|
         @opts[:drop_capabilities] = s
       }
 

lib/fluent/command/fluentd.rb

@@ -133,7 +133,7 @@
   }
 end
 
-op.on('--config-file-type VALU', 'guessing file type of fluentd configuration. yaml/yml or guess') { |s|
+op.on('--config-file-type VALUE', 'guessing file type of fluentd configuration. yaml/yml or guess') { |s|
   if (s == 'yaml') || (s == 'yml')
     cmd_opts[:config_file_type] = s.to_sym
   elsif (s == 'guess')

lib/fluent/config/element.rb

@@ -31,7 +31,7 @@ def initialize(name, arg, attrs, elements, unused = nil)
         @unused = unused || attrs.keys
         @v1_config = false
         @corresponding_proxies = [] # some plugins use flat parameters, e.g. in_http doesn't provide <format> section for parser.
-        @unused_in = nil # if this element is not used in plugins, correspoing plugin name and parent element name is set, e.g. [source, plugin class].
+        @unused_in = nil # if this element is not used in plugins, corresponding plugin name and parent element name is set, e.g. [source, plugin class].
 
         # it's global logger, not plugin logger: deprecated message should be global warning, not plugin level.
         @logger = defined?($log) ? $log : nil

lib/fluent/config/section.rb

@@ -150,7 +150,7 @@ def self.generate(proxy, conf, logger, plugin_class, stack = [], strict_config_v
             end
           end
           unless section_params.has_key?(proxy.argument.first)
-            logger.error "config error in:\n#{conf}" if logger # logger should exist, but somethimes it's nil (e.g, in tests)
+            logger.error "config error in:\n#{conf}" if logger # logger should exist, but sometimes it's nil (e.g, in tests)
             raise ConfigError, "'<#{proxy.name} ARG>' section requires argument" + section_stack
           end
           # argument should NOT be deprecated... (argument always has a value: '')

lib/fluent/counter/store.rb

@@ -156,7 +156,7 @@ def build_response(d)
         }
       end
 
-      # value is Hash. value requires these fileds.
+      # value is Hash. value requires these fields.
       # :name, :total, :current, :type, :reset_interval, :last_reset_at, :last_modified_at
       def build_value(data)
         type = data['type'] || 'numeric'

lib/fluent/engine.rb

@@ -177,7 +177,7 @@ def run
 
     # @param conf [Fluent::Config]
     # @param supervisor [Bool]
-    # @reutrn nil
+    # @return nil
     def reload_config(conf, supervisor: false)
       @root_agent_mutex.synchronize do
         # configure first to reduce down time while restarting

lib/fluent/event.rb

@@ -247,7 +247,7 @@ def ensure_unpacked!(unpacker: nil)
     end
 
     # This method returns MultiEventStream, because there are no reason
-    # to surve binary serialized by msgpack.
+    # to survey binary serialized by msgpack.
     def slice(index, num)
       ensure_unpacked!
       MultiEventStream.new(@unpacked_times.slice(index, num), @unpacked_records.slice(index, num))

lib/fluent/log/console_adapter.rb

@@ -19,7 +19,7 @@
 module Fluent
   class Log
     # Async gem which is used by http_server helper switched logger mechanism to
-    # Console gem which isn't complatible with Ruby's standard Logger (since
+    # Console gem which isn't compatible with Ruby's standard Logger (since
     # v1.17). This class adapts it to Fluentd's logger mechanism.
     class ConsoleAdapter < Console::Output::Terminal
       def self.wrap(logger)

lib/fluent/plugin/base.rb

@@ -206,7 +206,7 @@ def inspect
       end
 
       def reloadable_plugin?
-        # Engine can't capture all class variables. so it's forbbiden to use class variables in each plugins if enabling reload.
+        # Engine can't capture all class variables. so it's forbidden to use class variables in each plugins if enabling reload.
         self.class.class_variables.empty?
       end
     end

lib/fluent/plugin/buf_file.rb

@@ -191,7 +191,7 @@ def resume
         queue.sort_by!{ |chunk| chunk.modified_at }
 
         # If one of the files is corrupted, other files may also be corrupted and be undetected.
-        # The time priods of each chunk are helpful to check the data.
+        # The time periods of each chunk are helpful to check the data.
         if exist_broken_file
           log.info "Since a broken chunk file was found, it is possible that other files remaining at the time of resuming were also broken. Here is the list of the files."
           (stage.values + queue).each { |chunk|