docs: Fixed a typo and table symbols explanation layout

Signed-off-by: Wojciech Gryncewicz <wgryncewicz@antmicro.com>

docs/rules/layers/table-f2a-lvs-key.rst

diff --git a/docs/rules/layers/table-f2a-lvs-key.rst b/docs/rules/layers/table-f2a-lvs-key.rst
index 5b1f28a..b923848 100644
--- a/docs/rules/layers/table-f2a-lvs-key.rst
+++ b/docs/rules/layers/table-f2a-lvs-key.rst
@@ -1,4 +1,5 @@
 Explanation of symbols:
+
 * ``-`` = Layer illegal for the device
 * ``+`` = Layer allowed to overlap
 * ``D`` = DRAWN indicates that a layer is drawn by Design.

docs/rules/layers/table-f2b-mask-key.rst

diff --git a/docs/rules/layers/table-f2b-mask-key.rst b/docs/rules/layers/table-f2b-mask-key.rst
index ddbb215..6ebbc21 100644
--- a/docs/rules/layers/table-f2b-mask-key.rst
+++ b/docs/rules/layers/table-f2b-mask-key.rst
@@ -1,4 +1,5 @@
 Explanation of symbols:
+
 * ``-`` = Layer not created for the device
 * ``+`` = Layer allowed to overlap
 * ``C`` = CREATED

docs/rules/summary.rst

diff --git a/docs/rules/summary.rst b/docs/rules/summary.rst
index 0e99e4e..7ad4313 100644
--- a/docs/rules/summary.rst
+++ b/docs/rules/summary.rst
@@ -1,5 +1,5 @@
-Summry of Key Periphery Rules
-=============================
+Summary of Key Periphery Rules
+==============================
 
 .. csv-table:: Table F3a: Front end layers (Low Voltage Devices)
    :file: summary/table-f3a-font-end-low-voltage.csv