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

pages/common/xz.md

@@ -1,13 +1,13 @@
 # xz
 
-> Compress or decompress `.xz` and `.lzma` files.
+> Compress or decompress XZ and LZMA files.
 > More information: <https://manned.org/xz>.
 
 - Compress a file using xz:
 
 `xz {{path/to/file}}`
 
-- Decompress an xz file:
+- Decompress an XZ file:
 
 `xz --decompress {{path/to/file.xz}}`
 
@@ -15,7 +15,7 @@
 
 `xz --format=lzma {{path/to/file}}`
 
-- Decompress an lzma file:
+- Decompress an LZMA file:
 
 `xz --decompress --format=lzma {{path/to/file.lzma}}`