remove unnecessary indentation from markdown list

this makes it a bit easier to work with, as some tooling doesn't work
well with too much indentation.

doc/manual/src/command-ref/env-common.md

@@ -2,11 +2,13 @@
 
 Most Nix commands interpret the following environment variables:
 
-  - <span id="env-IN_NIX_SHELL">[`IN_NIX_SHELL`](#env-IN_NIX_SHELL)</span>\
+- <span id="env-IN_NIX_SHELL">[`IN_NIX_SHELL`](#env-IN_NIX_SHELL)</span>
+
   Indicator that tells if the current environment was set up by
   `nix-shell`. It can have the values `pure` or `impure`.
 
-  - <span id="env-NIX_PATH">[`NIX_PATH`](#env-NIX_PATH)</span>\
+- <span id="env-NIX_PATH">[`NIX_PATH`](#env-NIX_PATH)</span>
+
   A colon-separated list of directories used to look up the location of Nix
   expressions using [paths](@docroot@/language/values.md#type-path)
   enclosed in angle brackets (i.e., `<path>`),
@@ -24,7 +26,8 @@ Most Nix commands interpret the following environment variables:
 
       error: file 'nixpkgs' was not found in the Nix search path
 
-  - <span id="env-NIX_IGNORE_SYMLINK_STORE">[`NIX_IGNORE_SYMLINK_STORE`](#env-NIX_IGNORE_SYMLINK_STORE)</span>\
+- <span id="env-NIX_IGNORE_SYMLINK_STORE">[`NIX_IGNORE_SYMLINK_STORE`](#env-NIX_IGNORE_SYMLINK_STORE)</span>
+
   Normally, the Nix store directory (typically `/nix/store`) is not
   allowed to contain any symlink components. This is to prevent
   “impure” builds. Builders sometimes “canonicalise” paths by
@@ -46,31 +49,38 @@ Most Nix commands interpret the following environment variables:
 
   Consult the mount 8 manual page for details.
 
-  - <span id="env-NIX_STORE_DIR">[`NIX_STORE_DIR`](#env-NIX_STORE_DIR)</span>\
+- <span id="env-NIX_STORE_DIR">[`NIX_STORE_DIR`](#env-NIX_STORE_DIR)</span>
+
   Overrides the location of the Nix store (default `prefix/store`).
 
-  - <span id="env-NIX_DATA_DIR">[`NIX_DATA_DIR`](#env-NIX_DATA_DIR)</span>\
+- <span id="env-NIX_DATA_DIR">[`NIX_DATA_DIR`](#env-NIX_DATA_DIR)</span>
+
   Overrides the location of the Nix static data directory (default
   `prefix/share`).
 
-  - <span id="env-NIX_LOG_DIR">[`NIX_LOG_DIR`](#env-NIX_LOG_DIR)</span>\
+- <span id="env-NIX_LOG_DIR">[`NIX_LOG_DIR`](#env-NIX_LOG_DIR)</span>
+
   Overrides the location of the Nix log directory (default
   `prefix/var/log/nix`).
 
-  - <span id="env-NIX_STATE_DIR">[`NIX_STATE_DIR`](#env-NIX_STATE_DIR)</span>\
+- <span id="env-NIX_STATE_DIR">[`NIX_STATE_DIR`](#env-NIX_STATE_DIR)</span>
+
   Overrides the location of the Nix state directory (default
   `prefix/var/nix`).
 
-  - <span id="env-NIX_CONF_DIR">[`NIX_CONF_DIR`](#env-NIX_CONF_DIR)</span>\
+- <span id="env-NIX_CONF_DIR">[`NIX_CONF_DIR`](#env-NIX_CONF_DIR)</span>
+
   Overrides the location of the system Nix configuration directory
   (default `prefix/etc/nix`).
 
-  - <span id="env-NIX_CONFIG">[`NIX_CONFIG`](#env-NIX_CONFIG)</span>\
+- <span id="env-NIX_CONFIG">[`NIX_CONFIG`](#env-NIX_CONFIG)</span>
+
   Applies settings from Nix configuration from the environment.
   The content is treated as if it was read from a Nix configuration file.
   Settings are separated by the newline character.
 
-  - <span id="env-NIX_USER_CONF_FILES">[`NIX_USER_CONF_FILES`](#env-NIX_USER_CONF_FILES)</span>\
+- <span id="env-NIX_USER_CONF_FILES">[`NIX_USER_CONF_FILES`](#env-NIX_USER_CONF_FILES)</span>
+
   Overrides the location of the Nix user configuration files to load from.
 
   The default are the locations according to the [XDG Base Directory Specification].
@@ -78,12 +88,14 @@ Most Nix commands interpret the following environment variables:
 
   The variable is treated as a list separated by the `:` token.
 
-  - <span id="env-TMPDIR">[`TMPDIR`](#env-TMPDIR)</span>\
+- <span id="env-TMPDIR">[`TMPDIR`](#env-TMPDIR)</span>
+
   Use the specified directory to store temporary files. In particular,
   this includes temporary build directories; these can take up
   substantial amounts of disk space. The default is `/tmp`.
 
-  - <span id="env-NIX_REMOTE">[`NIX_REMOTE`](#env-NIX_REMOTE)</span>\
+- <span id="env-NIX_REMOTE">[`NIX_REMOTE`](#env-NIX_REMOTE)</span>
+
   This variable should be set to `daemon` if you want to use the Nix
   daemon to execute Nix operations. This is necessary in [multi-user
   Nix installations](@docroot@/installation/multi-user.md). If the Nix
@@ -91,16 +103,19 @@ Most Nix commands interpret the following environment variables:
   should be set to `unix://path/to/socket`. Otherwise, it should be
   left unset.
 
-  - <span id="env-NIX_SHOW_STATS">[`NIX_SHOW_STATS`](#env-NIX_SHOW_STATS)</span>\
+- <span id="env-NIX_SHOW_STATS">[`NIX_SHOW_STATS`](#env-NIX_SHOW_STATS)</span>
+
   If set to `1`, Nix will print some evaluation statistics, such as
   the number of values allocated.
 
-  - <span id="env-NIX_COUNT_CALLS">[`NIX_COUNT_CALLS`](#env-NIX_COUNT_CALLS)</span>\
+- <span id="env-NIX_COUNT_CALLS">[`NIX_COUNT_CALLS`](#env-NIX_COUNT_CALLS)</span>
+
   If set to `1`, Nix will print how often functions were called during
   Nix expression evaluation. This is useful for profiling your Nix
   expressions.
 
-  - <span id="env-GC_INITIAL_HEAP_SIZE">[`GC_INITIAL_HEAP_SIZE`](#env-GC_INITIAL_HEAP_SIZE)</span>\
+- <span id="env-GC_INITIAL_HEAP_SIZE">[`GC_INITIAL_HEAP_SIZE`](#env-GC_INITIAL_HEAP_SIZE)</span>
+
   If Nix has been configured to use the Boehm garbage collector, this
   variable sets the initial size of the heap in bytes. It defaults to
   384 MiB. Setting it to a low value reduces memory consumption, but