useful cli tools: fix typos and grammar

Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
Reviewed-By: Stoiko Ivanov <s.ivanov@proxmox.com>
Reviewed-By: Aaron Lauterer <a.lauterer@proxmox.com>

nmap.adoc

@@ -3,8 +3,8 @@
 -------------------
 
 `nmap` is designed to allow system administrators to scan large
-networks to determine which hosts are up and what services they are
+networks to determine which hosts are up and what services they
-offering. You can use nmap to test your firewall setting, for example
+offer. You can use nmap to test your firewall settings, for example
 to see if the required ports are open.
 
 .Test Razor port (tcp port 2703):
@@ -20,5 +20,6 @@ PORT     STATE SERVICE
 Nmap done: 1 IP address (1 host up) scanned in 6.83 seconds
 ----
 
-See the https://nmap.org/book/man.html[Nmap Reference Guide], also available as
+For more information about `nmap` usage, see the
-manual page (`man nmap`), for more information about nmap.
+https://nmap.org/book/man.html[Nmap Reference Guide], also available as a manual
+page (`man nmap`).

pmgdb.adoc

@@ -26,7 +26,7 @@ pmgdb - Database Management Toolkit
 endif::manvolnum[]
 
 The `pmgdb` toolkit is used to simplify common database management
-tasks. Most important, it is used internally to create and initialize
+tasks. Most importantly, it is used internally to create and initialize
 the default database. You can also use it to reset the filter rules
 back to factory defaults:
 
@@ -34,7 +34,7 @@ back to factory defaults:
 pmgdb reset
 ----
 
-Or you can dump a human readable copy of the filter rules:
+Or you can dump a human-readable copy of the filter rules:
 
 ----
 pmgdb dump

pmgperf.adoc

@@ -25,8 +25,8 @@ pmgperf - Proxmox Simple Performance Benchmark
 :pmg-toplevel:
 endif::manvolnum[]
 
-The command line tool `pmgperf` tries to gather some general
+The command line tool `pmgperf` gathers some general
-performance data. This is mostly useful for debugging and to identify
+performance data. This is mostly useful for debugging and identifying
 performance bottlenecks. It computes the following metrics:
 
 [horizontal]

pmgreport.adoc

@@ -25,7 +25,7 @@ pmgreport - Send daily system report email
 :pmg-toplevel:
 endif::manvolnum[]
 
-This binary generates and send daily system report email.
+Generates and sends the daily system report email.
 
 ifdef::manvolnum[]
 include::pmg-copyright.adoc[]

pmgsubscription.adoc

@@ -23,9 +23,9 @@ pmgsubscription - Subscription Management
 =========================================
 endif::manvolnum[]
 
-{pmg} is free open software, and the company that developed it
+{pmg} is free and open-source software. The company that develops it
 (Proxmox Server Solutions GmbH) offers {pricing-url}[support] in many
-ways, with different support channel, level and pricing.
+ways, with different support channels, levels, and pricing.
 
 The tool `pmgsubscription` is used to handle {pmg}
 subscriptions. Please use the GUI or the `set` command to upload a new

pmgupgrade.adoc

@@ -26,10 +26,10 @@ endif::manvolnum[]
 
 This is a small wrapper around `apt-get dist-upgrade`. We use this to
 print additional information (kernel restart required?), and
-optionally run an interactive shell after the update. This binary is
+optionally run an interactive shell after the update. It is
 invoked when starting an upgrade using the web GUI.
 
-If you are already logged in on the console, it is peferable to invoke
+If you are already logged in on the console, it is preferable to invoke
 `apt-get` directly.
 
 ----

pmgversion.adoc

@@ -24,7 +24,7 @@ pmgversion - Version Info
 :pmg-toplevel:
 endif::manvolnum[]
 
-The binary `pmgversion` prints detailed version information for {pmg}
+`pmgversion` prints detailed version information for {pmg}
 packages.
 
 .Examples
@@ -35,7 +35,7 @@ Print {pmg} version:
 # pmgversion
 ----
 
-List version details for important packages: 
+List version details for important packages:
 
 ----
 # pmgversion -v