Assort of documentation fixes

1. Add mising report item name for -r option in documentation

 HardwareInformation was added as a report item, but it has been
 missing in the documentaiton.  Add missing "HardwareInformation"
 report item for -r option, for completeness.
 (internal: 58d57dc, [SI-132])

2. Align documentation with implementation

 The description of pg_statsinfo.rusage_track* parameters in the manual
 was inconsistent with the implementation. This commit corrects that.

 Corrected items include:
 - Database Statistics > Database Resource Usage (rusage)
 - Query Activity > Statements (rusage)
   Plan User Time / Plan Sys Time / Exec User Time / Exec Sys Time
 (internal: 6505b1d, [SI-126])

3. Align documentation with implementation

 Fixed an incorrectly documented initial value in the repository.

 The corrected item is:

 In pg_statsinfo_v16_repository_information.xls, the initial value for
 the "garbage_size" item in the "alert" sheet was corrected from 20000
 to -1.
 (internal: dfaccdf, [SI-131])

Author: tashiro-hisashi

doc/files/pg_statsinfo_v15_report_infomation.xls

@@ -665,6 +665,7 @@ enable_alert カラムで行います。デフォルト値はpg_statsinfo.enable
       - SettingParameters
       - SchemaInformation
       - Profiles
+      - HardwareInformation
       - All
 
     レポート種別IDは、頭文字からの最短一致での指定を許容し、大文字と小文字を区別しません。

doc/files/pg_statsinfo_v15_repository_infomation.xls

@@ -721,6 +721,7 @@ Available options are described below,
       - SettingParameters
       - SchemaInformation
       - Profiles
+      - HardwareInformation
       - All
 
     REPORTID will be completed if it matches only one ID by case