fix(DOC-1675): restore auto-gen flags table to main; keep manual zone only

Per Michele's review: manual edits to the auto-generated flags table
will be overwritten on the next rpk doc regeneration. Restoring the
flags table to main's version; retaining only the safe manual zone
changes (heading, prose rewrite, overprovisioned xref).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mfernest

modules/reference/pages/rpk/rpk-redpanda/rpk-redpanda-start.adoc

@@ -34,7 +34,7 @@ Bundled cluster properties:
 * `topic_partitions_per_shard: 1000`
 * `fetch_reads_debounce_timeout: 10`
 
-After Redpanda starts, modify cluster properties by running:
+After Redpanda starts, you can modify cluster properties by running:
 
 [,bash]
 ----
@@ -77,7 +77,7 @@ Pandaproxy addresses to advertise.
 <host>:<port>
 ----
 
-|--check |- |When set to `false`, disables system checking before
+|--check |- |When set to `false`, will disable system checking before
 starting `redpanda` (default `true`).
 
 |-h, --help |- |Help for start.
@@ -128,9 +128,13 @@ to.
 <scheme>:<host>:<port>\|<name>
 ----
 
-|--timeout |duration |The maximum time to wait for the system checks and tuning processes to complete. The value passed is a sequence of decimal numbers, each with an optional fraction and a unit suffix, such as `300ms`, `1.5s` or `2h45m`. Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h` (default 10s).
+|--timeout |duration |The maximum time to wait for the checks and tune
+processes to complete. The value passed is a sequence of decimal
+numbers, each with optional fraction and a unit suffix, such as
+`300ms`, `1.5s` or `2h45m`. Valid time units are `ns`, `us`
+(or `µs`), `ms`, `s`, `m`, `h` (default 10s).
 
-|--tune |- |Enables tuning before starting `redpanda`.
+|--tune |- |When present will enable tuning before starting `redpanda`.
 
 |--well-known-io |string |The cloud vendor and VM type, in the format
 
@@ -139,9 +143,9 @@ to.
 <vendor>:<vm-type>:<storage-type>
 ----
 
-|--config |string |Path to the Redpanda or `rpk` configuration file. If not specified, `rpk` searches `/var/lib/redpanda/.config/rpk/rpk.yaml`, `$PWD/redpanda.yaml`, and `/etc/redpanda/redpanda.yaml`.
+|--config |string |Redpanda or `rpk` config file; default search paths are `/var/lib/redpanda/.config/rpk/rpk.yaml`, `$PWD/redpanda.yaml`, and `/etc/redpanda/redpanda.yaml`.
 
-|-X, --config-opt |stringArray |Override `rpk` configuration settings. See xref:reference:rpk/rpk-x-options.adoc[`rpk -X`] or execute `rpk -X help` for inline detail or `rpk -X list` for terse detail.
+|-X, --config-opt |stringArray |Override `rpk` configuration settings. See xref:reference:rpk/rpk-x-options.adoc[`rpk -X`] or execute `rpk -X help` for inline detail or `rpk -X list` for terser detail.
 
 |--profile |string |Profile to use. See xref:reference:rpk/rpk-profile.adoc[`rpk profile`] for more details.