pages*: fix various proper names, acronyms and initialisms (#12494)

pages/common/ptargrep.md

@@ -3,7 +3,7 @@
 > Find regular expression patterns in tar archive files.
 > More information: <https://manned.org/ptargrep>.
 
-- Search for a pattern within one or more `tar` archives:
+- Search for a pattern within one or more tar archives:
 
 `ptargrep "{{search_pattern}}" {{path/to/file1 path/to/file2 ...}}`
 
@@ -11,6 +11,6 @@
 
 `ptargrep --basename "{{search_pattern}}" {{path/to/file}}`
 
-- Search for a case-insensitive pattern matching within a `tar` archive:
+- Search for a case-insensitive pattern matching within a tar archive:
 
 `ptargrep --ignore-case "{{search_pattern}}" {{path/to/file}}`