Use <kbd> tags in documentation

doc/src/about.md

@@ -21,11 +21,12 @@ It allows you to:
 
 - browse the contents of a table, row by row, in paginated mode for large tables
 
-- edit the value of a column (type `RET` on the value you want to modify)
+- edit the value of a column (type <kbd>RET</kbd> on the value you want to modify)
 
-- delete a row (type `DEL` on the row you wish to delete)
+- delete a row (type <kbd>DEL</kbd> on the row you wish to delete)
 
-- copy/paste rows of a database table (type `k` to copy, `y` to paste in a table display buffer)
+- copy/paste rows of a database table (type <kbd>k</kbd> to copy, <kbd>y</kbd> to paste in a table
+  display buffer)
 
 - export the contents of a table to CSV or TSV format
 

doc/src/editing.md

@@ -7,7 +7,7 @@ database table.
 ## Editing a column value
 
 If your table has a primary key, you can edit the contents of the table. To modify a value, move the
-cursor to the relevant column value and type `RET`. This will prompt you for the new value, and
+cursor to the relevant column value and type <kbd>RET</kbd>. This will prompt you for the new value, and
 immediately update the cell to the value you specified (it sends PostgreSQL an SQL command similar
 to `UPDATE table_name SET column_name to X WHERE pk_col1 = value1 AND pk_col2 = value2`, where
 `pk_col1` and `pk_col2` are the names of the columns that comprise the primary key constraint).
@@ -30,22 +30,22 @@ If you wish to abort editing, simply kill this editing buffer.
 
 ## Inserting, copying and deleting rows
 
-To insert a new row into a table, press `+` in the row-list buffer. You will be prompted for the values
-of each column for which a default value is not specified (in the minibuffer), then the new row will
-be inserted. You can also insert a new row by entering new values in a widget-based buffer by
-pressing `i` (this may be more convenient if the table contains many rows, or the values to enter
-are very long).
+To insert a new row into a table, press <kbd>+</kbd> in the row-list buffer. You will be prompted
+for the values of each column for which a default value is not specified (in the minibuffer), then
+the new row will be inserted. You can also insert a new row by entering new values in a widget-based
+buffer by pressing <kbd>i</kbd> (this may be more convenient if the table contains many rows, or the
+values to enter are very long).
 
-To delete the row at point, press `<delete>` or `<backspace>` in a table buffer and confirm. Please
-note that this deletes the current row in the PostgreSQL database, as well as in the Emacs buffer.
-Deleting rows is only possible on tables that include a primary key constraint (this can be a single
-column specified as `PRIMARY KEY`, or a constraint across a group of columns).
+To delete the row at point, press <kbd>Del</kbd> or <kbd>Backspace</kbd> in a table buffer and
+confirm. Please note that this deletes the current row in the PostgreSQL database, as well as in the
+Emacs buffer. Deleting rows is only possible on tables that include a primary key constraint (this
+can be a single column specified as `PRIMARY KEY`, or a constraint across a group of columns).
 
-To copy/paste rows, press `k` to copy the row to the PGmacs kill buffer (this only copies, without
-deleting the row), then `y` to insert a new row with the same values. Any columns that have a
-default value specified (for example, primary key rows that pull a value from an integer sequence,
-or are specified as `SERIAL`, or timestamp values that default to `now`) will be inserted with a new
-generated value, rather than the value in the copied row.
+To copy/paste rows, press <kbd>k</kbd> to copy the row to the PGmacs kill buffer (this only copies,
+without deleting the row), then <kbd>y</kbd> to insert a new row with the same values. Any columns
+that have a default value specified (for example, primary key rows that pull a value from an integer
+sequence, or are specified as `SERIAL`, or timestamp values that default to `now`) will be inserted
+with a new generated value, rather than the value in the copied row.
 
 All updates, insertions and deletions are immediately synced with the PostgreSQL server by sending it
 the appropriate SQL `UPDATE TABLE`, `DELETE FROM` or `INSERT INTO` commands.
@@ -54,10 +54,10 @@ the appropriate SQL `UPDATE TABLE`, `DELETE FROM` or `INSERT INTO` commands.
 
 ## Running a shell command on a cell value
 
-Typing `!` in a row-list buffer runs a shell-command on the current cell value, and displays the
-output in the echo area. The cell value is sent as standard input to the shell command, as for the
-Emacs function `shell-command-on-region`. If called with a prefix argument, the current cell value
-is replaced by the output of the cell command, and the PostgreSQL database is updated.
+Typing <kbd>!</kbd> in a row-list buffer runs a shell-command on the current cell value, and
+displays the output in the echo area. The cell value is sent as standard input to the shell command,
+as for the Emacs function `shell-command-on-region`. If called with a prefix argument, the current
+cell value is replaced by the output of the cell command, and the PostgreSQL database is updated.
 
 For example, to count the length in characters of the current cell value (or of its displayed
 representation, when it is not a text field), type