docs: several small documentation fixes.

docs/source/appendix/primer.rst

@@ -221,7 +221,7 @@ design description as input and generates an RTL, logical gate or physical gate
 level description of the design as output. Yosys' main strengths are behavioural
 and RTL synthesis. A wide range of commands (synthesis passes) exist within
 Yosys that can be used to perform a wide range of synthesis tasks within the
-domain of behavioural, rtl and logic synthesis. Yosys is designed to be
+domain of behavioural, RTL and logic synthesis. Yosys is designed to be
 extensible and therefore is a good basis for implementing custom synthesis tools
 for specialised tasks.
 

docs/source/using_yosys/more_scripting/interactive_investigation.rst

@@ -73,7 +73,7 @@ contain bits that are not 0 or 1 (i.e. ``x`` or ``z``). Ordinary 32-bit
 constants are written using decimal numbers.
 
 Single-bit signals are shown as thin arrows pointing from the driver to the
-load. Signals that are multiple bits wide are shown as think arrows.
+load. Signals that are multiple bits wide are shown as thick arrows.
 
 Finally *processes* are shown in boxes with round corners. Processes are Yosys'
 internal representation of the decision-trees and synchronization events

docs/source/using_yosys/synthesis/abc.rst

@@ -176,5 +176,5 @@ implemented as whiteboxes too.
 Boxes are arguably the biggest advantage that ABC9 has over ABC: by being aware
 of carry chains and DSPs, it avoids optimising for a path that isn't the actual
 critical path, while the generally-longer paths result in ABC9 being able to
-reduce design area by mapping other logic to larger-but-slower cells.
+reduce design area by mapping other logic to smaller-but-slower cells.
 

docs/source/yosys_internals/flow/verilog_frontend.rst

@@ -626,7 +626,7 @@ pass and the passes it launches:
    | This pass replaces the ``RTLIL::SyncRule``\ s to d-type flip-flops (with
      asynchronous resets if necessary).
 
--  | `proc_dff`
+-  | `proc_memwr`
    | This pass replaces the ``RTLIL::MemWriteAction``\ s with `$memwr` cells.
 
 -  | `proc_clean`