7z: apply standard syntax for options (#2935)

Apply standard syntax for option -m and remove spaces from Italian version.

pages.it/common/7z.md

@@ -8,7 +8,7 @@
 
 - Cripta un archivio esistente (inclusi gli header):
 
-`7z a {{archivio_criptato.7z}} -p {{password}} -mhe {{archivio.7z}}`
+`7z a {{archivio_criptato.7z}} -p{{password}} -mhe=on {{archivio.7z}}`
 
 - Estrai un archivio mantenendo la gerarchia delle directory:
 
@@ -16,7 +16,7 @@
 
 - Estrai un archivio in una specifica directory:
 
-`7z x {{archivio.7z}} -o {{percorso/alla/directory}}`
+`7z x {{archivio.7z}} -o{{percorso/alla/directory}}`
 
 - Archivia utilizzando uno specifico tipo di archivio:
 

pages.zh/common/7z.md

@@ -8,7 +8,7 @@
 
 - 对已存在的归档文件加密(包括头部):
 
-`7z a {{加密文件.7z}} -p{{密码}} -mhe {{归档文件.7z}}`
+`7z a {{加密文件.7z}} -p{{密码}} -mhe=on {{归档文件.7z}}`
 
 - 提取一个已存在的7z文件，并保持原来的目录结构:
 

pages/common/7z.md

@@ -9,7 +9,7 @@
 
 - Encrypt an existing archive (including headers):
 
-`7z a {{encrypted.7z}} -p{{password}} -mhe {{archived.7z}}`
+`7z a {{encrypted.7z}} -p{{password}} -mhe=on {{archived.7z}}`
 
 - Extract an existing 7z file with original directory structure: